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Basis of Presentation and Accounting Policies Level 4 (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings |  | $ 88 |  |
OCI, before Reclassifications |  | (920) | $ 157 |
Available-for-sale Securities, Equity Securities |  | 0 |  | $ 1,012
Fee income |  | 323 | 278 |
Other Income |  | 20 | 19 |
Total revenues subject to updated guidance |  | 342 | 298 |
Operating Expense [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Distribution Costs |  |  | 46 |
Equity Securities [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Available-for-sale Securities, Equity Securities |  |  |  | $ 1,012
Net Unrealized Gain on Securities |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
OCI, before Reclassifications | $ 83 | (882) | 160 |
Net Unrealized Gain on Securities | Equity Securities [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
OCI, before Reclassifications | 93 |  |  |
Available-for-sale Securities, Equity Securities |  | 1,000 |  |
Discontinued Operations [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Tax Cuts and Jobs Act of 2017, Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  | 0 |  |
Discontinued Operations [Member] | Net Unrealized Gain on Securities |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
OCI, before Reclassifications | $ 10 |  |  |
Continuing Operations [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings |  | 105 |  |
Installment billing fees [Member] | Operating Segments | Commercial Lines Segment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Fee income |  | 9 | 10 |
Installment billing fees [Member] | Operating Segments | Personal Lines Segment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Fee income |  | 10 | 11 |
Fee Income [Member] | Corporate |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Fee income |  | 2 | 1 |
Insurance servicing fees [Member] | Operating Segments | Personal Lines Segment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other Income |  | 19 | 19 |
Administrative services fees [Member] | Operating Segments | Group Benefits Segment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Fee income |  | 44 | 19 |
Advisor, distribution and other management fees [Member] | Asset Management Income [Member] | Operating Segments | Mutual Funds |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Fee income |  | 238 | 212 |
Other fees [Member] | Fee Income [Member] | Operating Segments | Mutual Funds |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Fee income |  | $ 20 | $ 26 |

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