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Debt and Interest Costs - FV, Maturities, etc. (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Long term debt value      
Unamortized debt issuance costs $ 62    
Long term debt maturities      
2022 3    
2023 1,800    
2024 1,400    
2025 1,000    
2026 750    
Thereafter 2,800    
Letters of credit, outstanding amount 62 $ 43  
Total interest paid and accrued      
Interest paid during period $ 306 332 $ 331
Ownership interest in guarantor subsidiaries (as a percent) 100.00%    
Leverage ratio, maximum 5.0    
Leverage ratio, subsequent period 4.5    
Level 2      
Long term debt value      
Fair value of the long-term debt $ 8,000 8,300  
Carrying value $ 7,700 $ 7,800