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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 03, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect | $ (88) |  |  |  |  |  |  |
Equity securities, AFS |  |  | $ 0 |  |  | $ 0 |  | $ 1,012
Fee income |  |  | 327 |  | $ 286 | 650 | $ 564 |
Other revenues |  |  | 24 |  | 23 | 44 | 42 |
Total revenues subject to updated guidance |  |  | 352 |  | 309 | 694 | 606 |
Operating Expense [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Distribution Costs |  |  |  |  | 46 |  | 92 |
Net Unrealized Gain on Securities |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect of accounting change net of income taxes |  |  |  |  |  |  |  | 273
Net Unrealized Gain on Securities | Equity Securities [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Equity securities, AFS | 1,000 |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect |  |  |  | $ (193) |  |  |  |
Cumulative effect of accounting change net of income taxes | 10 |  |  |  |  |  |  |
Corporate |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Fee income |  |  | 4 |  | 0 | 6 | 1 |
Other revenues |  |  | 2 |  | 0 | 2 | 0 |
Continuing Operations [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect | (105) |  |  |  |  |  |  |
Installment billing fees | Operating Segments | Commercial Lines |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Fee income |  |  | 8 |  | 9 | 17 | 19 |
Installment billing fees | Operating Segments | Personal Lines |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Fee income |  |  | 10 |  | 11 | 20 | 22 |
Insurance servicing revenues | Operating Segments | Personal Lines |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Other revenues |  |  | 23 |  | 23 | 42 | 42 |
Administrative services | Operating Segments | Group Benefits |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Fee income |  |  | 44 |  | 19 | 88 | 38 |
Advisor, distribution and other management fees | Operating Segments | Mutual Funds |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Fee income |  |  | 239 |  | 220 | 477 | 431 |
Other fees | Operating Segments | Mutual Funds |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Fee income |  |  | 22 |  | $ 27 | 42 | $ 53 |
Maximum [Member] | Discontinued Operations, Held-for-sale [Member] | Other Income [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Discontinued Operation, Period of Continuing Involvement after Disposal |  | 24 months |  |  |  |  |  |
Equity Securities [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect of accounting change net of income taxes | 83 |  |  |  |  |  |  |
Equity securities, AFS |  |  |  |  |  |  |  | $ 1,012
Shadow DAC [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect of accounting change net of income taxes | $ 10 |  |  |  |  |  |  |

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