Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Investments [Line Items]
Gross gains on sales	$ 31	$ 78
Gross losses on sales	(31)	(8)
Reduction due to intent to sell	0	(5)
Total net realized capital gains	80	(231)
Equity Securities, FV-NI, Unrealized Gain (Loss)	40	(277)
Other, net
Schedule of Investments [Line Items]
Other, net	29	104
Non-qualifying foreign currency derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	35	92
Non-qualifying foreign currency derivatives | Other Credit Derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	(7)	10
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity securities	43	(386)
Total Fixed Maturities, AFS
Schedule of Investments [Line Items]
Change in ACL on fixed maturities, AFS	4	(12)
Mortgages [Member]
Schedule of Investments [Line Items]
Change in ACL on mortgage loans	$ 4	$ (2)