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Debt and Interest Costs - FV, Maturities, etc. (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Long term debt value      
Carrying value $ 7,800 $ 6,500  
Unamortized debt issuance costs 65    
Long term debt maturities      
2020 1,400    
2021 1    
2022 751    
2023 1,800    
2024 1,400    
Thereafter 2,400    
Letters of credit, outstanding amount 37 28  
Total interest paid and accrued      
Interest paid during period $ 331 304 $ 287
Ownership interest in guarantor subsidiaries (as a percent) 100.00%    
Leverage ratio, maximum 4.5    
Level 2      
Long term debt value      
Fair value of the long-term debt $ 8,300 $ 6,600