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Investments (Net Unrealized Gains Losses on Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Gain (Loss) on Securities [Line Items]
Net unrealized gains (losses) on investments	$ 37,449	$ 58,417
Fixed maturities | Available-for-sale | With an allowance
Gain (Loss) on Securities [Line Items]
Net unrealized gains (losses) on investments	(5)	(25)
Fixed maturities | Available-for-sale | Without an allowance
Gain (Loss) on Securities [Line Items]
Net unrealized gains (losses) on investments	37,610	58,593
Derivatives designated as cash flow hedges
Gain (Loss) on Securities [Line Items]
Net unrealized gains (losses) on investments	(159)	(168)
Derivatives designated as fair value hedges
Gain (Loss) on Securities [Line Items]
Net unrealized gains (losses) on investments	12	10
Other investments
Gain (Loss) on Securities [Line Items]
Net unrealized gains (losses) on investments	(9)	$ 7
Other investments | Held-to-maturity
Gain (Loss) on Securities [Line Items]
Net unrealized gains (losses) on investments	$ 0

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