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Investments (Fixed Maturity Proceeds) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Securities [Line Items]
Proceeds from maturities/prepayments - AFS	$ 21,470	$ 9,997
Proceeds from maturities/prepayments - HTM	11	40
Fixed maturities | Available-for-sale
Debt Securities [Line Items]
Proceeds from sales	14,690	5,153
Proceeds from maturities/prepayments - AFS	6,894	4,883
Gross investment gains from sales and maturities	1,603	468
Gross investment losses from sales and maturities	(389)	(61)
Write-down recognized in earnings	0	(91)
(Addition to) release of allowance for credit losses - AFS	2	(158)
Fixed maturities | Held-to-maturity
Debt Securities [Line Items]
Proceeds from maturities/prepayments - HTM	12	41
(Addition to) release of allowance for credit Losses - HTM	2	0
Fixed maturities | Available-for-sale
Debt Securities [Line Items]
Noncash or Part Noncash Divestiture, Amount of Consideration Received	114	39
Fixed maturities | Held-to-maturity
Debt Securities [Line Items]
Noncash or Part Noncash Divestiture, Amount of Consideration Received	$ 1	$ 1

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