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Equity - Statutory Results (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income | $ 253 | $ 861 | $ 2,025
Statutory Capital | 12,977 | 14,283 |
Group Benefits Insurance Subsidiary |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income | (1,066) | 208 | 168
Statutory Capital | 2,029 | 1,624 |
Property and Casualty Insurance Subsidiaries |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income | 950 | 304 | 1,486
Statutory Capital | 7,396 | 8,261 |
Life and Annuity Run-Off Business |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net Income | 369 | 349 | $ 371
Statutory Capital | $ 3,552 | $ 4,398 |

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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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