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Debt Obligations Debt Obligations (Future Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2017 $ 1,817  
2018 2,530  
2019 9,483  
2020 4,960  
2021 2,706  
Thereafter 22,462  
Long-term Debt 43,802 $ 36,968
Excluding unamortized premiums and fair value adjustments [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 43,958