XML 81 R53.htm IDEA: XBRL DOCUMENT v3.4.0.3
Financial Instruments (Estimated Fair Value of Debt, Financing and Capital Lease Obligations) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current and long-term debt, carrying amount $ 33,645 $ 33,245
Current and long-term debt, total estimated fair value 28,361 33,554
Quoted prices in active markets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current and long-term debt, total estimated fair value 21,757 27,238
Observable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current and long-term debt, total estimated fair value 4,474 4,906
Unobservable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current and long-term debt, total estimated fair value $ 2,130 $ 1,410