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Commitments and Contingencies Level 4 (Details) - Annual Purchase Commitments
$ in Millions
Dec. 31, 2015
USD ($)
Long-term Purchase Commitment [Line Items]  
P2016Y $ 293
P2017Y 241
P2018Y 112
P2019Y 105
P2020Y 95
2021 and beyond 84
Total minimum payments 930
Less: Amount representing interest (60)
Present Value of Minimum Payments $ 870