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Long-Term Debt (Maturities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Disclosure [Abstract] |  |
2017 | $ 6 |
2018 | 2,013 |
2019 | 606 |
2020 | 806 |
2021 | 6 |
Thereafter | 887 |
Total debt | $ 4,324 | $ 4,561

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- Definition Long term debt maturities and capital lease obligations repayments of principal after ​year​ five. + References No definition available. + Details
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- Definition Long term debt maturities and capital lease obligations repayments of principal in next twelve months. + References No definition available. + Details
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- Definition Long term debt maturities and capital lease obligations repayments of principal in year five. + References No definition available. + Details
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- Definition Long term debt maturities and capital lease obligations repayments of principal in year four. + References No definition available. + Details
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- Definition Long term debt maturities and capital lease obligations repayments of principal in year three. + References No definition available. + Details
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- Definition Long term debt maturities and capital lease obligations repayments of principal in year two. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of long-term debt and capital lease obligations including current maturities. + References No definition available. + Details
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