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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Debt Instrument, Fair Value Disclosure $ 1,988 $ 1,674
Reported Value Measurement [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Fair Value Disclosure 43,620 43,227
Estimate of Fair Value Measurement [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Fair Value Disclosure $ 43,061 $ 37,481