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Debt Obligations Maturities of Long Term Debt (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Maturities of Long Term Debt Disclosure [Abstract]  
Long-term Debt $ 3,014
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 52
Long-term Debt, Maturities, Repayments of Principal in Year Two 84
Long-term Debt, Maturities, Repayments of Principal in Year Three 90
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,485
Long-term Debt, Maturities, Repayments of Principal in Year Five 600
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 703