Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans Summary of RSU Transactions (Details)

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Employee Benefit Plans Summary of RSU Transactions (Details) (Restricted Stock Units [Member], USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Restricted Stock Units [Member]
 
Summary of RSU Transactions for All Equity Compensation Plans, Additional Disclosures [Abstract]  
RSUs outstanding at beginning of period, weighted average grant date fair value $ 48.69
RSUs granted, weighted average grant date fair value $ 58.67
RSUs cancelled/forfeited, weighted average grant date fair value $ 51.30
RSUs vested, weighted average grant date fair value $ 50.21
RSUs outstanding at end of period, weighted average grant date fair value $ 53.22
RSUs outstanding at end of period, aggregate intrinsic value $ 2,100,000,000
Summary of Restricted Stock Units [Roll Forward]  
RSUs outstanding at beginning of period 22,752
RSUs granted 17,315
RSUs cancelled/forfeited (957)
RSUs vested (6,188)
RSUs outstanding at end of period 32,922
Unrecognized compensation expense related to nonvested awards $ 1,200,000,000
Weighted average period over which unrecognized compensation expense related to nonvested awards is expected to be recognized 1 year 9 months 18 days