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Segment Information (Reconciliation Of Income (Loss) From Operations By Segment To Consolidated Net Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on early extinguishment of debt, after-tax |  |  |  |  |  |  |  |  | $ (42) | $ (23) | $ 5
Impairment of intangibles, after-tax |  |  |  |  |  |  |  |  |  |  | (905)
Net income (loss) | $ 431 | $ (161) | $ 363 | $ 252 | $ 399 | $ 490 | $ 385 | $ 367 | 886 | 1,641 | 2,079
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Excluded realized gain (loss), after-tax |  |  |  |  |  |  |  |  | (627) | (37) | (218)
Gain (loss) on early extinguishment of debt, after-tax |  |  |  |  |  |  |  |  | (33) | (18) | (3)
Benefit ratio unlocking, after-tax |  |  |  |  |  |  |  |  | 277 | (136) | 129
Net impact from the Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | 17 | 19 | 1,322
Impairment of intangibles, after-tax |  |  |  |  |  |  |  |  |  |  | (905)
Acquisition and integration costs related to mergers and acquisitions, after tax |  |  |  |  |  |  |  |  | (103) | (67) |
Annuities Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangibles, after-tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 954 | 1,102 | 1,074
Retirement Plan Services Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangibles, after-tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 172 | 171 | 149
Life Insurance Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangibles, after-tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 259 | 645 | 536
Group Protection Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangibles, after-tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 238 | 187 | 103
Other Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ (268) | $ (225) | $ (108)

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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