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Long-Term Debt - Long Term Debt Maturities Schedule (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
2016 [1] $ 5,064  
2017 1,525  
2018 275  
2019 186  
2020 0  
Thereafter 2,460  
Total $ 9,510 $ 16,427
Weighted average interest rate on debt maturing in next twelve months 3.975%  
[1] Weighted average interest rate on long-term debt maturing in 2016 is 3.975 percent.