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Financing Receivables - Credit Quality - Residential Mortgage Loans by Region (Details) - Consumer Loans - Residential mortgage loans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing receivables - credit quality information
Loans	$ 466	$ 300
Minnesota
Financing receivables - credit quality information
Loans	284	178
Other U.S. States
Financing receivables - credit quality information
Loans	$ 182	$ 122
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	61.00%	59.00%
Total residential mortgage loans | Credit concentration risk | Other U.S. States
Financing receivables - credit quality information
Percentage of total	39.00%	41.00%

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