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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | $ 418 | $ 467 | $ 1,264 | $ 1,002
Annuities Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | 277 | 240 | 809 | 693
Retirement Plan Services Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | 35 | 32 | 109 | 94
Life Insurance Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | 121 | 167 | 384 | 361
Group Protection Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | 41 | 28 | 83 | 49
Other Operations [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | (20) | (26) | (71) | (66)
Excluded realized gain (loss), after-tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | (63) | (4) | (149) | (164)
Gain (loss) on early extinguishment of debt, after-tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | (3) |  | (3) |
Income (loss) from reserve changes (net of related amortization) on business sold through reinsurance, after-tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from discontinued operations, after-tax |  |  | 1 | 1
Benefit ratio unlocking, after-tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | $ 30 | $ 30 | $ 101 | $ 34

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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4613673-111683 + Details
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