Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Available-for-sale debt securities
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 26	$ 0
Charged (Credited) to costs and expenses	29	82
Charged (Credited) to other accounts	0	0
Other deductions	(32)	(56)
Balance at end of year	23	26	$ 0
Balance	23	26	0
Commercial mortgage loans
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	6	0
Charged (Credited) to costs and expenses	0	(1)
Charged (Credited) to other accounts	0	7
Other deductions	0	0
Balance at end of year	6	6	0
Balance	6	6	0
Commercial mortgage loans | Adjustment upon Adoption
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance				$ 7
Accounts receivable, net
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	156	252	217
Charged (Credited) to costs and expenses	54	(50)	51
Charged (Credited) to other accounts	0	(12)	0
Other deductions	(84)	(34)	(16)
Balance at end of year	126	156	252
Balance	126	156	252
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	207	196	199
Charged (Credited) to costs and expenses	23	10	(6)
Charged (Credited) to other accounts	16	1	3
Other deductions	0	0	0
Balance at end of year	246	207	196
Balance	246	207	196
Reinsurance recoverables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	32	2	2
Charged (Credited) to costs and expenses	(2)	(1)	0
Charged (Credited) to other accounts	0	31	0
Other deductions	0	0	0
Balance at end of year	30	32	2
Balance	$ 30	$ 32	$ 2
Reinsurance recoverables | Adjustment upon Adoption
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance				$ 31