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Contingencies and Commitments (Future Purchase Obligations and Minimum Lease Payments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 1,373
2020 844
2021 750
2022 0
2023 630
Thereafter 6,355
Purchase obligations  
2019 1,306
2020 74
2021 6
2022 6
2023 7
Thereafter 12
Minimum lease payments  
2019 107
2020 53
2021 39
2022 30
2023 24
Thereafter $ 89