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Share Repurchases in the Open Market (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Oct. 31, 2014
Stockholders' Equity Note [Abstract]    
Stock Repurchase Program, Authorized Amount   $ 5,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Remaining Authorized Amount 4,900,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1  
Shares repurchased in the open market 3us-gaap_StockRepurchasedAndRetiredDuringPeriodShares [1]  
Average repurchase price per share (2) $ 259.52us-gaap_TreasuryStockAcquiredAverageCostPerShare [2]  
Total cost $ 803,000,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue  
[1] All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
[2] Figures in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers.