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Leases - Annual Payments Based on the Maturities of Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
2020 $ 96  
2021 87  
2022 87  
2023 85  
2024 75  
Thereafter 296  
Total undiscounted lease payments 726  
Less present value adjustment (170)  
Operating lease liability $ 556 $ 321