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Contingencies and Commitments (Future Purchase Obligations and Minimum Lease Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 600
2019 1,250
2020 500
2021 750
2022 0
Thereafter 4,150
Purchase obligations  
2018 1,046
2019 95
2020 2
2021 1
2022 0
Thereafter 0
Minimum lease payments  
2018 106
2019 63
2020 45
2021 31
2022 21
Thereafter $ 60