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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
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Mar. 31, 2019 | Mar. 31, 2018
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |
Net income (loss) | $ 252 | $ 367
Segment Reconciling Items [Member] |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |
Excluded realized gain (loss), after-tax | (316) | (28)
Gain (loss) on early extinguishment of debt, after-tax |  | (19)
Benefit ratio unlocking, after-tax | 142 | (10)
Net impact from the Tax Cuts and Jobs Act |  | (13)
Acquisition and integration costs related to mergers and acquisitions, after tax | (15) | (4)
Annuities Segment [Member] |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |
Net income (loss) | 250 | 267
Retirement Plan Services Segment [Member] |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |
Net income (loss) | 39 | 43
Life Insurance Segment [Member] |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |
Net income (loss) | 157 | 144
Group Protection Segment [Member] |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |
Net income (loss) | 55 | 29
Other Operations [Member] |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |
Net income (loss) | $ (60) | $ (42)

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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act. + References No definition available. + Details
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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=84229725&loc=d3e1043-128460 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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