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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, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Financing receivables - credit quality information
Less: allowance for loan losses	$ 64	$ 59	$ 57	$ 50
Commercial Loans
Financing receivables - credit quality information
Less: allowance for loan losses	56	54	$ 53	$ 47
Commercial Loans \| Commercial mortgage loans
Financing receivables - credit quality information
Loans	1,823	1,882
Less: allowance for loan losses	10	11
Total loans	1,813	1,871
Commercial Loans \| Commercial mortgage loans \| East North Central
Financing receivables - credit quality information
Loans	192	201
Commercial Loans \| Commercial mortgage loans \| East South Central
Financing receivables - credit quality information
Loans	51	54
Commercial Loans \| Commercial mortgage loans \| Middle Atlantic
Financing receivables - credit quality information
Loans	113	114
Commercial Loans \| Commercial mortgage loans \| Mountain
Financing receivables - credit quality information
Loans	136	129
Commercial Loans \| Commercial mortgage loans \| New England
Financing receivables - credit quality information
Loans	22	23
Commercial Loans \| Commercial mortgage loans \| Pacific
Financing receivables - credit quality information
Loans	631	638
Commercial Loans \| Commercial mortgage loans \| South Atlantic
Financing receivables - credit quality information
Loans	449	479
Commercial Loans \| Commercial mortgage loans \| West North Central
Financing receivables - credit quality information
Loans	113	120
Commercial Loans \| Commercial mortgage loans \| West South Central
Financing receivables - credit quality information
Loans	$ 116	$ 124
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans
Financing receivables - credit quality information
Percentage of total	100.00%	100.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| East North Central
Financing receivables - credit quality information
Percentage of total	11.00%	11.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| East South Central
Financing receivables - credit quality information
Percentage of total	3.00%	3.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Middle Atlantic
Financing receivables - credit quality information
Percentage of total	6.00%	6.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Mountain
Financing receivables - credit quality information
Percentage of total	7.00%	7.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| New England
Financing receivables - credit quality information
Percentage of total	1.00%	1.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Pacific
Financing receivables - credit quality information
Percentage of total	35.00%	34.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| South Atlantic
Financing receivables - credit quality information
Percentage of total	25.00%	25.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| West North Central
Financing receivables - credit quality information
Percentage of total	6.00%	6.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| West South Central
Financing receivables - credit quality information
Percentage of total	6.00%	7.00%