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Debt (Details 2) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Long Term Debt By Maturity Abstract    
2018 $ 3,654  
2019 7,150  
2020 6,600  
2021 2,939  
2022 2,050  
Thereafter 2,000  
Total 24,393  
Unamortized Underwriting Fees (49) $ (39)
Unamortized Discount and Premium (36)  
Impacts due to Fair Value Hedge Accounting (155)  
Total Long-term Debt $ 24,153 $ 20,512