Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements Fair Value Hierarchy (Details)

v3.10.0.1
Fair Value Measurements Fair Value Hierarchy (Details) - Fair Value, Measurements, Recurring [Member]
$ in Millions
Sep. 30, 2018
USD ($)
Assets  
Cash equivalents $ 10,014
Marketable securities 346
Derivative instruments 3
Other investments 396
Total assets measured at fair value 10,759
Liabilities  
Derivative instruments 71
Other liabilities 466
Total liabilities measured at fair value 537
Level 1 [Member]  
Assets  
Cash equivalents 7,147
Marketable securities 167
Derivative instruments 0
Other investments 380
Total assets measured at fair value 7,694
Liabilities  
Derivative instruments 0
Other liabilities 380
Total liabilities measured at fair value 380
Level 2 [Member]  
Assets  
Cash equivalents 2,867
Marketable securities 144
Derivative instruments 3
Other investments 0
Total assets measured at fair value 3,014
Liabilities  
Derivative instruments 71
Other liabilities 0
Total liabilities measured at fair value 71
Level 3 [Member]  
Assets  
Cash equivalents 0
Marketable securities 35
Derivative instruments 0
Other investments 16
Total assets measured at fair value 51
Liabilities  
Derivative instruments 0
Other liabilities 86
Total liabilities measured at fair value 86
Corporate bonds and notes [Member]  
Assets  
Marketable securities 144
Corporate bonds and notes [Member] | Level 1 [Member]  
Assets  
Marketable securities 0
Corporate bonds and notes [Member] | Level 2 [Member]  
Assets  
Marketable securities 144
Corporate bonds and notes [Member] | Level 3 [Member]  
Assets  
Marketable securities 0
Auction rate securities [Member]  
Assets  
Marketable securities 35
Auction rate securities [Member] | Level 1 [Member]  
Assets  
Marketable securities 0
Auction rate securities [Member] | Level 2 [Member]  
Assets  
Marketable securities 0
Auction rate securities [Member] | Level 3 [Member]  
Assets  
Marketable securities 35
Equity and preferred securities [Member]  
Assets  
Marketable securities 167
Equity and preferred securities [Member] | Level 1 [Member]  
Assets  
Marketable securities 167
Equity and preferred securities [Member] | Level 2 [Member]  
Assets  
Marketable securities 0
Equity and preferred securities [Member] | Level 3 [Member]  
Assets  
Marketable securities $ 0