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Financing Receivables - Residential Mortgage Loans by Region (Details) - Consumer Loans - Residential mortgage loans - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Financing receivables - credit quality information
Loans	$ 671	$ 466
Total residential mortgage loans | Credit concentration risk
Financing receivables - credit quality information
Percentage of total	100.00%	100.00%
Minnesota
Financing receivables - credit quality information
Loans	$ 394	$ 284
Minnesota | Total residential mortgage loans | Credit concentration risk
Financing receivables - credit quality information
Percentage of total	59.00%	61.00%
Other U.S. States
Financing receivables - credit quality information
Loans	$ 277	$ 182
Other U.S. States | Total residential mortgage loans | Credit concentration risk
Financing receivables - credit quality information
Percentage of total	41.00%	39.00%

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