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New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
AFS Equity securities |  |  |  |  | $ 246
Equity Securities, FV-NI | $ 112 |  | $ 112 |  |
Federal rate | 21.00% | 35.00% | 21.00% | 35.00% | 35.00%
Accounting Standards Update 2016-01 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
AFS Equity securities |  |  |  |  | $ 246
Equity Securities, FV-NI |  |  |  |  | 110
Cumulative effect of adoption |  |  |  |  | 1
Accounting Standards Update 2016-01 [Member] | Scenario, Adjustment [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
AFS Equity securities |  |  |  |  | 136
Accounting Standards Update 2018-02 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification from AOCI to retained earnings |  |  |  |  | $ 641

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