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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Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Property Type (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Concentrations of credit risk by property type
Less: allowance for loan losses	$ 48	$ 50	$ 68	$ 68
Commercial Loans
Concentrations of credit risk by property type
Less: allowance for loan losses	45	47	$ 65	$ 66
Commercial Loans \| Commercial mortgage loans
Concentrations of credit risk by property type
Loans	1,934	1,916
Less: allowance for loan losses	12	12
Total loans	1,922	1,904
Commercial Loans \| Commercial mortgage loans \| Apartments
Concentrations of credit risk by property type
Loans	512	496
Commercial Loans \| Commercial mortgage loans \| Hotel
Concentrations of credit risk by property type
Loans	15	14
Commercial Loans \| Commercial mortgage loans \| Industrial
Concentrations of credit risk by property type
Loans	321	319
Commercial Loans \| Commercial mortgage loans \| Mixed use
Concentrations of credit risk by property type
Loans	67	68
Commercial Loans \| Commercial mortgage loans \| Office
Concentrations of credit risk by property type
Loans	266	271
Commercial Loans \| Commercial mortgage loans \| Retail
Concentrations of credit risk by property type
Loans	617	617
Commercial Loans \| Commercial mortgage loans \| Other
Concentrations of credit risk by property type
Loans	$ 136	$ 131
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans
Concentrations of credit risk by property type
Percentage of total	100.00%	100.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Apartments
Concentrations of credit risk by property type
Percentage of total	26.00%	26.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Hotel
Concentrations of credit risk by property type
Percentage of total	1.00%	1.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Industrial
Concentrations of credit risk by property type
Percentage of total	17.00%	17.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Mixed use
Concentrations of credit risk by property type
Percentage of total	3.00%	3.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Office
Concentrations of credit risk by property type
Percentage of total	14.00%	14.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Retail
Concentrations of credit risk by property type
Percentage of total	32.00%	32.00%
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans \| Other
Concentrations of credit risk by property type
Percentage of total	7.00%	7.00%