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New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings | $ 8,647 |  | $ 8,854
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings |  | $ (218) |
Accounting Standards Update 2019-05 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings |  | $ 15 |

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