Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	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	$ 23	$ 26	$ 0
Charged (Credited) to costs and expenses	43	29	82
Charged (Credited) to other accounts	0	0	0
Other deductions	(22)	(32)	(56)
Balance at end of year	44	23	26
Valuation allowance	44	23	26
Commercial mortgage loans
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	6	6	0
Charged (Credited) to costs and expenses	15	0	(1)
Charged (Credited) to other accounts	0	0	7
Other deductions	0	0	0
Balance at end of year	21	6	6
Valuation allowance	21	6	6
Commercial mortgage loans | Adjustment upon Adoption
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance				$ 7
Accounts receivable, net
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	126	156	252
Charged (Credited) to costs and expenses	99	54	(50)
Charged (Credited) to other accounts	0	0	(12)
Other deductions	(65)	(84)	(34)
Balance at end of year	160	126	156
Valuation allowance	160	126	156
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	246	207	196
Charged (Credited) to costs and expenses	(13)	23	10
Charged (Credited) to other accounts	(25)	16	1
Other deductions	0	0	0
Balance at end of year	208	246	207
Valuation allowance	208	246	207
Reinsurance recoverables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	30	32	2
Charged (Credited) to costs and expenses	7	(2)	(1)
Charged (Credited) to other accounts	0	0	31
Other deductions	0	0	0
Balance at end of year	37	30	32
Valuation allowance	$ 37	$ 30	$ 32
Reinsurance recoverables | Adjustment upon Adoption
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance				$ 31