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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Region (Details) - Commercial Loans - Commercial mortgage loans - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Financing receivables - credit quality information
Loans	$ 1,993	$ 1,902
East North Central
Financing receivables - credit quality information
Loans	187	185
East South Central
Financing receivables - credit quality information
Loans	45	45
Middle Atlantic
Financing receivables - credit quality information
Loans	120	133
Mountain
Financing receivables - credit quality information
Loans	169	157
New England
Financing receivables - credit quality information
Loans	35	30
Pacific
Financing receivables - credit quality information
Loans	667	633
South Atlantic
Financing receivables - credit quality information
Loans	538	489
West North Central
Financing receivables - credit quality information
Loans	114	119
West South Central
Financing receivables - credit quality information
Loans	$ 118	$ 111
Total commercial mortgage loans | Credit concentration risk
Financing receivables - credit quality information
Percentage of total	100.00%	100.00%
Total commercial mortgage loans | Credit concentration risk | East North Central
Financing receivables - credit quality information
Percentage of total	9.00%	10.00%
Total commercial mortgage loans | Credit concentration risk | East South Central
Financing receivables - credit quality information
Percentage of total	2.00%	2.00%
Total commercial mortgage loans | Credit concentration risk | Middle Atlantic
Financing receivables - credit quality information
Percentage of total	6.00%	7.00%
Total commercial mortgage loans | Credit concentration risk | Mountain
Financing receivables - credit quality information
Percentage of total	8.00%	8.00%
Total commercial mortgage loans | Credit concentration risk | New England
Financing receivables - credit quality information
Percentage of total	2.00%	2.00%
Total commercial mortgage loans | Credit concentration risk | Pacific
Financing receivables - credit quality information
Percentage of total	34.00%	33.00%
Total commercial mortgage loans | Credit concentration risk | South Atlantic
Financing receivables - credit quality information
Percentage of total	27.00%	26.00%
Total commercial mortgage loans | Credit concentration risk | West North Central
Financing receivables - credit quality information
Percentage of total	6.00%	6.00%
Total commercial mortgage loans | Credit concentration risk | West South Central
Financing receivables - credit quality information
Percentage of total	6.00%	6.00%

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