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Debt (Narrative) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term borrowings | $ 0 | $ 0
Accrued interest on long-term debt | 219,000,000 |
Reported Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 13,900,000,000 | 13,900,000,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 14,300,000,000 | $ 15,300,000,000

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