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Segment Information (Reconciliation of Net Investment Income From Segments to Consolidated) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Investment Income [Abstract] |  |  |
Total net investment income | $ 5,223 | $ 5,085 | $ 4,990
Annuities Segment [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Total net investment income | 1,140 | 1,005 | 1,038
Retirement Plan Services Segment [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Total net investment income | 924 | 899 | 899
Life Insurance Segment [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Total net investment income | 2,658 | 2,697 | 2,643
Group Protection Segment [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Total net investment income | 307 | 260 | 168
Other Operations [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Total net investment income | $ 194 | $ 224 | $ 242

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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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