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Debt Maturties of Debt
$ in Millions
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 2,828
Long-term Debt, Maturities, Repayments of Principal in Year Two 2,820
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,204
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,422
Long-term Debt, Maturities, Repayments of Principal in Year Five 2,558
Long-term Debt, Maturities, Repayments of Principal after Year Five 24,084
Total debt outstanding $ 36,916