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Segment Information (Reconciliation of Net Investment Income From Segments to Consolidated) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Investment Income [Abstract]
Total net investment income	$ 5,510	$ 5,223	$ 5,085
Annuities Segment [Member]
Net Investment Income [Abstract]
Total net investment income	1,272	1,140	1,005
Retirement Plan Services Segment [Member]
Net Investment Income [Abstract]
Total net investment income	933	924	899
Life Insurance Segment [Member]
Net Investment Income [Abstract]
Total net investment income	2,823	2,658	2,697
Group Protection Segment [Member]
Net Investment Income [Abstract]
Total net investment income	330	307	260
Other Operations [Member]
Net Investment Income [Abstract]
Total net investment income	$ 152	$ 194	$ 224

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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

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- References

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