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Contingencies and Commitments (Future Purchase Obligations and Minimum Lease Payments) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 200
Long-term Debt, Maturities, Repayments of Principal in Year Two 602
Long-term Debt, Maturities, Repayments of Principal in Year Three 750
Long-term Debt, Maturities, Repayments of Principal in Year Four 500
Long-term Debt, Maturities, Repayments of Principal in Year Five 750
Long-term Debt, Maturities, Repayments of Principal after Year Five 4,150
Purchase obligations  
2017 737
2018 75
2019 59
2020 5
2021 4
Thereafter 77
Minimum lease payments  
2017 90
2018 47
2019 34
2020 24
2021 15
Thereafter $ 59