Financing Receivables - Credit Quality - Commercial Mortgage Loans by Region (Details) - Commercial Loans - Commercial mortgage loans - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing receivables - credit quality information
Loans	$ 1,837	$ 1,832
East North Central
Financing receivables - credit quality information
Loans	191	189
East South Central
Financing receivables - credit quality information
Loans	47	52
Middle Atlantic
Financing receivables - credit quality information
Loans	113	112
Mountain
Financing receivables - credit quality information
Loans	146	138
New England
Financing receivables - credit quality information
Loans	27	28
Pacific
Financing receivables - credit quality information
Loans	619	624
South Atlantic
Financing receivables - credit quality information
Loans	466	465
West North Central
Financing receivables - credit quality information
Loans	107	109
West South Central
Financing receivables - credit quality information
Loans	$ 121	$ 115
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	10.00%	10.00%
Total commercial mortgage loans | Credit concentration risk | East South Central
Financing receivables - credit quality information
Percentage of total	3.00%	3.00%
Total commercial mortgage loans | Credit concentration risk | Middle Atlantic
Financing receivables - credit quality information
Percentage of total	6.00%	6.00%
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	1.00%	2.00%
Total commercial mortgage loans | Credit concentration risk | Pacific
Financing receivables - credit quality information
Percentage of total	34.00%	34.00%
Total commercial mortgage loans | Credit concentration risk | South Atlantic
Financing receivables - credit quality information
Percentage of total	25.00%	25.00%
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	7.00%	6.00%