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Stockholders' Equity - Narrative (Details)
$ / shares in Units, £ in Millions, shares in Millions, € in Billions
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2017
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Feb. 29, 2016
USD ($)
Jul. 31, 2015
$ / shares
Apr. 30, 2017
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Mar. 31, 2017
EUR (€)
vote
Mar. 31, 2017
USD ($)
vote
Mar. 31, 2017
GBP (£)
vote
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
May 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Dividends Payable [Line Items]                                
Number of votes | vote                   1 1 1        
Cash dividends declared per common share (in dollars per share) | $ / shares             $ 1.12 $ 1.08 $ 0.96              
Shares repurchase plans authorized                         $ 4,000,000,000.0 $ 2,000,000,000 $ 500,000,000  
Shares bought | shares             15.5 8.7 1.5              
Shares repurchased             $ 2,250,000,000 $ 1,504,000,000 $ 340,000,000              
Average price paid per share (in dollars per share) | $ / shares             $ 141.16 $ 173.64 $ 226.55              
Total authorization outstanding for repurchases of common stock           $ 996,000,000   $ 996,000,000 $ 0   $ 2,746,000,000         $ 340,000,000
Repurchase of common stock             $ 2,250,000,000 $ 1,504,000,000 340,000,000              
Treasury stock retired (in shares) | shares               115.5                
Other comprehensive income (loss) before reclassifications             (688,000,000) $ 142,000,000                
Net foreign currency translation gains (losses)             (659,000,000) 172,000,000 $ (1,989,000,000)              
Losses from net investment hedges             $ 13,000,000                  
Total debt outstanding           $ 8,107,000,000   $ 8,107,000,000     $ 8,362,000,000          
Treasury Stock                                
Dividends Payable [Line Items]                                
Repurchase of common stock (in shares) | shares             16.0 9.0 2.0              
Repurchase of common stock             $ 2,200,000,000 $ 1,504,000,000 $ 340,000,000              
Retirement of common stock               7,800,000,000                
Retained Earnings                                
Dividends Payable [Line Items]                                
Retirement of common stock               6,400,000,000                
Additional Paid-in Capital                                
Dividends Payable [Line Items]                                
Repurchase of common stock (in shares) | shares             50.0                  
Retirement of common stock               1,500,000,000                
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest                                
Dividends Payable [Line Items]                                
Other comprehensive income (loss) before reclassifications             $ (644,000,000) 113,000,000 (1,845,000,000)              
Net foreign currency translation gains (losses)             (624,000,000) 113,000,000 $ (1,855,000,000)              
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest                                
Dividends Payable [Line Items]                                
Net foreign currency translation gains (losses)             (74,000,000) 16,000,000                
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest                                
Dividends Payable [Line Items]                                
Other comprehensive income (loss) before reclassifications             $ (5,000,000) $ 4,000,000                
Open Market Transactions                                
Dividends Payable [Line Items]                                
Shares bought | shares               4.5                
Shares repurchased               $ 854,000,000                
Average price paid per share (in dollars per share) | $ / shares             $ 140.96 $ 192.27                
Repurchase of common stock (in shares) | shares             14.1                  
Repurchase of common stock             $ 2,000,000,000                  
Accelerated Share Repurchase                                
Dividends Payable [Line Items]                                
Shares bought | shares   1.4       4.2                    
Shares repurchased   $ 250,000,000 $ 650,000,000                          
Average price paid per share (in dollars per share) | $ / shares   $ 143.19       $ 154.04                    
Minimum                                
Dividends Payable [Line Items]                                
Cash dividends declared per common share (in dollars per share) | $ / shares       $ 0.24                        
Maximum                                
Dividends Payable [Line Items]                                
Cash dividends declared per common share (in dollars per share) | $ / shares       $ 0.28                        
Notes | Euro Denominated Notes                                
Dividends Payable [Line Items]                                
Total debt outstanding | €                   € 1.2            
Notes | British Pound Sterling Denominated Notes                                
Dividends Payable [Line Items]                                
Total debt outstanding | £                       £ 450        
Subsequent Event | Accelerated Share Repurchase                                
Dividends Payable [Line Items]                                
Shares bought | shares 0.3       1.7