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Contingencies and Commitments (Future Purchase Obligations and Minimum Lease Payments) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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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

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