Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Investments [Line Items]
Gross gains on sales	$ 27	$ 77	$ 201	$ 190
Gross losses on sales	(12)	(4)	(42)	(44)
Reduction due to intent to sell	0	0	(5)	0
Net OTTI losses recognized in earnings		(1)		(3)
Total net realized capital gains	6	89	(116)	332
Equity Securities, FV-NI, Unrealized Gain (Loss)	36	17	6	100
Gain (Loss) on Disposition of Business	51		51
Proceeds from Sale of Available-for-sale Securities	4,500	2,600	11,700	11,500
Debt Securities, Available-for-sale, Amortized Cost	41,073		41,073		$ 40,078
Corporate
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	17,930		17,930		$ 16,435
Other, net
Schedule of Investments [Line Items]
Other, net	(55)	(2)	51	7
Non-qualifying foreign currency derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	(2)	(5)	97	3
Non-qualifying foreign currency derivatives | Other Credit Derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	(4)		6
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity securities	42	19	(269)	181
Total Fixed Maturities, AFS
Schedule of Investments [Line Items]
Change in ACL on fixed maturities, AFS	(1)		(33)
Mortgages [Member]
Schedule of Investments [Line Items]
Change in ACL on mortgage loans	$ 5		$ (19)
Valuation allowances on mortgage loans		$ 0		$ 1