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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Region (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Financing receivables - credit quality information
Less: allowance for credit losses	$ 57	$ 50	$ 51	$ 68
Commercial Loans
Financing receivables - credit quality information
Less: allowance for credit losses	53	47	$ 48	$ 66
Commercial Loans \| Commercial mortgage loans
Financing receivables - credit quality information
Loans	1,920	1,916
Less: allowance for credit losses	12	12
Total loans	1,908	1,904
Commercial Loans \| Commercial mortgage loans \| East North Central
Financing receivables - credit quality information
Loans	208	194
Commercial Loans \| Commercial mortgage loans \| East South Central
Financing receivables - credit quality information
Loans	55	57
Commercial Loans \| Commercial mortgage loans \| Middle Atlantic
Financing receivables - credit quality information
Loans	110	122
Commercial Loans \| Commercial mortgage loans \| Mountain
Financing receivables - credit quality information
Loans	132	119
Commercial Loans \| Commercial mortgage loans \| New England
Financing receivables - credit quality information
Loans	24	28
Commercial Loans \| Commercial mortgage loans \| Pacific
Financing receivables - credit quality information
Loans	639	627
Commercial Loans \| Commercial mortgage loans \| South Atlantic
Financing receivables - credit quality information
Loans	496	497
Commercial Loans \| Commercial mortgage loans \| West North Central
Financing receivables - credit quality information
Loans	131	141
Commercial Loans \| Commercial mortgage loans \| West South Central
Financing receivables - credit quality information
Loans	$ 125	$ 131
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans
Financing receivables - credit quality information
Percent of Total Fair Value	100.00%	100.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| East North Central
Financing receivables - credit quality information
Percent of Total Fair Value	11.00%	10.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| East South Central
Financing receivables - credit quality information
Percent of Total Fair Value	3.00%	3.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Middle Atlantic
Financing receivables - credit quality information
Percent of Total Fair Value	6.00%	6.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Mountain
Financing receivables - credit quality information
Percent of Total Fair Value	7.00%	6.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| New England
Financing receivables - credit quality information
Percent of Total Fair Value	1.00%	2.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Pacific
Financing receivables - credit quality information
Percent of Total Fair Value	33.00%	33.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| South Atlantic
Financing receivables - credit quality information
Percent of Total Fair Value	26.00%	26.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| West North Central
Financing receivables - credit quality information
Percent of Total Fair Value	7.00%	7.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| West South Central
Financing receivables - credit quality information
Percent of Total Fair Value	6.00%	7.00%