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General Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 20 | $ 470 | $ 450 |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect on Retained Earnings, Tax | $ 7 |  |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (417) |  |  | $ (417) |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | $ (454) |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  | $ 800

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