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Commitments and Contingencies Level 4 (Details) - Annual Purchase Commitments
$ in Millions
Dec. 31, 2016
USD ($)
Long-term Purchase Commitment [Line Items]  
2017 $ 218
2018 93
2019 81
2020 81
2021 9
2022 and beyond 74
Total minimum payments 556
Less: Amount representing interest (40)
Present Value of Minimum Payments $ 516