Financing Receivables - Credit Quality - Residential Mortgage Loans by Region (Details) - Consumer Loans - Residential mortgage loans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing receivables - credit quality information
Loans	$ 300	$ 117
Minnesota
Financing receivables - credit quality information
Loans	178	82
Other U.S. States
Financing receivables - credit quality information
Loans	$ 122	$ 35
Total residential mortgage loans | Credit concentration risk
Financing receivables - credit quality information
Percentage of total	100.00%	100.00%
Total residential mortgage loans | Credit concentration risk | Minnesota
Financing receivables - credit quality information
Percentage of total	59.00%	70.00%
Total residential mortgage loans | Credit concentration risk | Other U.S. States
Financing receivables - credit quality information
Percentage of total	41.00%	30.00%