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Long-Term Debt and Short-Term Borrowings - Post-Swap Borrowing (Long-Term Debt, Including Current Portion) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Long-Term Debt |  |
Total long-term debt | $ 13,198 | $ 11,478
Fixed-rate debt |  |
Long-Term Debt |  |
Interest rate - effective | 2.45% | 2.42%
Total long-term debt | $ 9,681 | $ 8,372
Floating-rate debt |  |
Long-Term Debt |  |
Interest rate - effective | 0.76% | 0.48%
Total long-term debt | $ 3,517 | $ 3,106

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