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Long-Term Debt - Long Term Debt Maturities Schedule (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
2017 [1] $ 1,448  
2018 271  
2019 155  
2020 0  
2021 2,326  
Thereafter 140  
Long-term debt $ 4,340 $ 9,510
Weighted average interest rate on debt maturing in next twelve months 4.42%  
[1] Weighted average interest rate on long-term debt maturing in 2017 is 4.42 percent.