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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
New Accounting Pronouncement, Early Adoption [Line Items]    
Income tax expense related to continuing operations $ 239 $ 256
Net discrete tax benefits $ 35 $ 5
Income tax rate (as a percent) 26.20% 29.90%
Unrecognized tax benefits $ 414  
Unrecognized tax benefits that would reduce income tax expense and the effective tax rate 274  
Income tax (benefit) expense (3) $ 6
Accrued interest and penalties on unrecognized tax benefits 49 $ 75
Effect of Early Adoption of ASU 2016-09 [Member]    
New Accounting Pronouncement, Early Adoption [Line Items]    
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount $ 37