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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 9,317  
Long-term Debt, Maturities, Repayments of Principal in Year Two 12,133  
Long-term Debt, Maturities, Repayments of Principal in Year Three 9,722  
Long-term Debt, Maturities, Repayments of Principal in Year Four 7,372  
Long-term Debt, Maturities, Repayments of Principal in Year Five 3,154  
Long-term Debt, Maturities, Repayments of Principal after Year Five 9,064  
Derivative, Amount of Hedged Item 299 $ 315
Long-term debt 51,061 54,128
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,742  
Long-term Debt, Maturities, Repayments of Principal in Year Two 3,599  
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,642  
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,197  
Long-term Debt, Maturities, Repayments of Principal in Year Five 596  
Long-term Debt, Maturities, Repayments of Principal after Year Five 7,446  
Derivative, Amount of Hedged Item 308 326
Long-term debt 17,530 20,050
Debt Instrument, Unamortized Discount (69)  
Debt Instrument, Unamortized Discount (1,304)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period One [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (101)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Two [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (39)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Three [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (39)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Four [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (42)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Five [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (1,014)  
Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 7,575  
Long-term Debt, Maturities, Repayments of Principal in Year Two 8,534  
Long-term Debt, Maturities, Repayments of Principal in Year Three 8,080  
Long-term Debt, Maturities, Repayments of Principal in Year Four 5,175  
Long-term Debt, Maturities, Repayments of Principal in Year Five 2,558  
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,618  
Derivative, Amount of Hedged Item (9) (11)
Long-term debt 33,531 $ 34,078
Long-term Debt [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,811  
Long-term Debt, Maturities, Repayments of Principal in Year Two 3,700  
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,681  
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,236  
Long-term Debt, Maturities, Repayments of Principal in Year Five 638  
Long-term Debt, Maturities, Repayments of Principal after Year Five 8,460  
Derivative, Amount of Hedged Item 308  
Long-term debt 18,834  
original issue discount [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Derivative, Amount of Hedged Item $ 0