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Short-Term and Long-Term Debt (Schedule of Extinguishment of Debt) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract] |  |  |  |
Principal balance outstanding prior to payoff | [1] | $ 109 | $ 287 |
Unamortized debt issuance costs and discounts |  | (1) | (1) | $ 5
Amount paid to retire debt |  | (150) | (309) |
Gain (loss) on early extinguishment of debt, pre-tax |  | (42) | (23) | $ 5
6.15% Notes, Due 2036 [Member] |  |  |  |
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract] |  |  |  |
Debt Instrument Repurchase Amount |  | $ 105 |  |
Interest rate |  | 6.15% |  |
4.85% Notes, Due 2021 [Member] |  |  |  |
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract] |  |  |  |
Debt Instrument Repurchase Amount |  | $ 4 |  |
Interest rate |  | 4.85% |  |
8.75% notes, due 2019 [Member] |  |  |  |
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract] |  |  |  |
Debt Instrument Repurchase Amount |  |  | $ 287 |
Interest rate |  |  | 8.75% |
[1] | During the third quarter of 2019, we repurchased $105 million of our 6.15% senior notes due 2036 and $4 million of our 4.85% senior notes due 2021. During the first quarter of 2018, we repurchased $287 million of our 8.75% senior notes due 2019.

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