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New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Income tax benefit |  |  |  | $ 949 | $ (266) | $ (276)
Impairment |  |  |  | 905 |  |
Equity securities | $ 246 |  |  | $ 246 | 275 |
Federal rate |  |  |  | 35.00% |  |
Deferred tax impact from the Tax Cut and Jobs Act |  |  |  | $ (1,322) |  |
Scenario, Forecast [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Federal rate |  |  | 21.00% |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Income tax benefit |  |  |  |  | $ 8 |
Reclassification from additional paid-in capital |  | $ 3 |  |  |  |
Accounting Standards Update 2017-04 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impairment | 905 |  |  |  |  |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Equity securities | $ 110 |  |  | $ 110 |  |
Accounting Standards Update 2018-02 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred tax impact from the Tax Cut and Jobs Act |  |  | $ 600 |  |  |

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