Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Fair Value Hierarchy (Details)

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Fair Value Measurements Fair Value Hierarchy (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Assets, Fair Value Disclosure [Abstract]  
Cash equivalents $ 1,959
U.S. Treasury securities and government-related securities 1,686
Corporate bonds and notes 15,029
Mortgage- and asset-backed securities 1,557
Auction rate securities 83
Common and preferred stock 2,360
Equity funds 1,354
Debt funds 5,800
Total marketable securities 27,869
Derivative instruments 66
Other investments 230
Total assets measured at fair value 30,124
Liabilities, Fair Value Disclosure [Abstract]  
Derivative instruments 12
Other liabilities 230
Total liabilities measured at fair value 242
Level 1 [Member]
 
Assets, Fair Value Disclosure [Abstract]  
Cash equivalents 1,278
U.S. Treasury securities and government-related securities 870
Corporate bonds and notes 0
Mortgage- and asset-backed securities 0
Auction rate securities 0
Common and preferred stock 1,506
Equity funds 1,354
Debt funds 2,261
Total marketable securities 5,991
Derivative instruments 1
Other investments 230
Total assets measured at fair value 7,500
Liabilities, Fair Value Disclosure [Abstract]  
Derivative instruments 0
Other liabilities 230
Total liabilities measured at fair value 230
Level 2 [Member]
 
Assets, Fair Value Disclosure [Abstract]  
Cash equivalents 681
U.S. Treasury securities and government-related securities 816
Corporate bonds and notes 15,029
Mortgage- and asset-backed securities 1,253
Auction rate securities 0
Common and preferred stock 854
Equity funds 0
Debt funds 3,539
Total marketable securities 21,491
Derivative instruments 65
Other investments 0
Total assets measured at fair value 22,237
Liabilities, Fair Value Disclosure [Abstract]  
Derivative instruments 12
Other liabilities 0
Total liabilities measured at fair value 12
Level 3 [Member]
 
Assets, Fair Value Disclosure [Abstract]  
Cash equivalents 0
U.S. Treasury securities and government-related securities 0
Corporate bonds and notes 0
Mortgage- and asset-backed securities 304
Auction rate securities 83
Common and preferred stock 0
Equity funds 0
Debt funds 0
Total marketable securities 387
Derivative instruments 0
Other investments 0
Total assets measured at fair value 387
Liabilities, Fair Value Disclosure [Abstract]  
Derivative instruments 0
Other liabilities 0
Total liabilities measured at fair value $ 0