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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Property Type (Details) - Commercial Loans - Commercial mortgage loans - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Concentrations of credit risk by property type
Loans	$ 1,944	$ 1,902
Apartments
Concentrations of credit risk by property type
Loans	552	522
Hotel
Concentrations of credit risk by property type
Loans	33	33
Industrial
Concentrations of credit risk by property type
Loans	359	362
Mixed use
Concentrations of credit risk by property type
Loans	69	68
Office
Concentrations of credit risk by property type
Loans	216	219
Retail
Concentrations of credit risk by property type
Loans	547	546
Other
Concentrations of credit risk by property type
Loans	$ 168	$ 152
Total commercial mortgage loans | Credit concentration risk
Concentrations of credit risk by property type
Percentage of total	100.00%	100.00%
Total commercial mortgage loans | Credit concentration risk | Apartments
Concentrations of credit risk by property type
Percentage of total	28.00%	27.00%
Total commercial mortgage loans | Credit concentration risk | Hotel
Concentrations of credit risk by property type
Percentage of total	2.00%	2.00%
Total commercial mortgage loans | Credit concentration risk | Industrial
Concentrations of credit risk by property type
Percentage of total	18.00%	19.00%
Total commercial mortgage loans | Credit concentration risk | Mixed use
Concentrations of credit risk by property type
Percentage of total	4.00%	4.00%
Total commercial mortgage loans | Credit concentration risk | Office
Concentrations of credit risk by property type
Percentage of total	11.00%	11.00%
Total commercial mortgage loans | Credit concentration risk | Retail
Concentrations of credit risk by property type
Percentage of total	28.00%	29.00%
Total commercial mortgage loans | Credit concentration risk | Other
Concentrations of credit risk by property type
Percentage of total	9.00%	8.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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