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Investments (Realized Investment Gains Losses, Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	$ 2,079	$ 1,667
Fixed maturities
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	1,216	158
Commercial mortgage and other loans
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	30	22
Investment real estate
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	52	(1)
LPs/LLCs
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	0	(3)
Derivatives
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	775	1,492
Other
Gain (Loss) on Securities [Line Items]
Realized investment gains (losses), net	$ 6	$ (1)

X

- Definition

Amount of realized gain (loss) on investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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