Investments - Investments - Net Realized Capital Gains (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Investments [Line Items]
Gross gains on sales	$ 96,000,000	$ 69,000,000	$ 174,000,000	$ 113,000,000
Gross losses on sales	(22,000,000)	(19,000,000)	(30,000,000)	(40,000,000)
Reduction due to intent to sell	0	0	(5,000,000)	0
Net OTTI losses recognized in earnings		0		(2,000,000)
Total net realized capital gains	109,000,000	80,000,000	(122,000,000)	243,000,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	67,000,000	29,000,000	(34,000,000)	74,000,000
Proceeds from Sale of Available-for-sale Securities	4,100,000,000	4,600,000,000	7,200,000,000	8,900,000,000
Other, net
Schedule of Investments [Line Items]
Other, net	2,000,000	(1,000,000)	106,000,000	9,000,000
Non-qualifying foreign currency derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	7,000,000	(7,000,000)	99,000,000	8,000,000
Non-qualifying foreign currency derivatives | Other Credit Derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	0		10,000,000
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity securities	75,000,000	30,000,000	(311,000,000)	162,000,000
Total Fixed Maturities, AFS
Schedule of Investments [Line Items]
Change in ACL on fixed maturities, AFS	(20,000,000)		(32,000,000)
Mortgages [Member]
Schedule of Investments [Line Items]
Change in ACL on mortgage loans	$ (22,000,000)		$ (24,000,000)
Valuation allowances on mortgage loans		$ 1,000,000		$ 1,000,000