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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Property Type (Details) - Commercial Loans - Commercial mortgage loans - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Concentrations of credit risk by property type
Loans	$ 1,887	$ 1,832
Apartments
Concentrations of credit risk by property type
Loans	519	485
Hotel
Concentrations of credit risk by property type
Loans	33	13
Industrial
Concentrations of credit risk by property type
Loans	344	317
Mixed use
Concentrations of credit risk by property type
Loans	68	64
Office
Concentrations of credit risk by property type
Loans	219	241
Retail
Concentrations of credit risk by property type
Loans	552	561
Other
Concentrations of credit risk by property type
Loans	$ 152	$ 151
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	27.00%	26.00%
Total commercial mortgage loans | Credit concentration risk | Hotel
Concentrations of credit risk by property type
Percentage of total	2.00%	1.00%
Total commercial mortgage loans | Credit concentration risk | Industrial
Concentrations of credit risk by property type
Percentage of total	18.00%	17.00%
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	12.00%	13.00%
Total commercial mortgage loans | Credit concentration risk | Retail
Concentrations of credit risk by property type
Percentage of total	29.00%	31.00%
Total commercial mortgage loans | Credit concentration risk | Other
Concentrations of credit risk by property type
Percentage of total	8.00%	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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