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Commitments and Contingencies Level 4 (Details) - Annual Purchase Commitments
$ in Millions
Dec. 31, 2018
USD ($)
Long-term Purchase Commitment [Line Items]  
2019 $ 234
2020 117
2021 119
2022 44
2023 37
2024 and beyond 314
Total minimum payments 865
Less: Amount representing interest (102)
Present Value of Minimum Payments $ 763