Financing Receivables - Credit Quality - Commercial Mortgage Loans by LTV Ratio and Year of Origination (Details) - Commercial Loans - Commercial mortgage loans - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	$ 204	$ 134
Originated in Fiscal Year before Latest Fiscal Year	123	262
Originated Two Years before Latest Fiscal Year	223	195
Originated Three Years before Latest Fiscal Year	115	289
Originated Four Years before Latest Fiscal Year	176	230
Originated Five or More Years before Latest Fiscal Year	1,075	1,615
Total amortized cost basis	1,916	2,725
Greater than 100 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Originated Two Years before Latest Fiscal Year	20	2
Originated Three Years before Latest Fiscal Year	10
Originated Five or More Years before Latest Fiscal Year	29	10
Total amortized cost basis	59	12
80 to 100 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	9	15
Originated in Fiscal Year before Latest Fiscal Year	2	16
Originated Two Years before Latest Fiscal Year	9	12
Originated Three Years before Latest Fiscal Year	2	3
Originated Four Years before Latest Fiscal Year		7
Originated Five or More Years before Latest Fiscal Year	29	15
Total amortized cost basis	51	68
60 to 80 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	142	89
Originated in Fiscal Year before Latest Fiscal Year	80	166
Originated Two Years before Latest Fiscal Year	60	27
Originated Three Years before Latest Fiscal Year	23	32
Originated Four Years before Latest Fiscal Year	61	46
Originated Five or More Years before Latest Fiscal Year	138	144
Total amortized cost basis	504	504
40 to 60 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	42	23
Originated in Fiscal Year before Latest Fiscal Year	33	57
Originated Two Years before Latest Fiscal Year	86	74
Originated Three Years before Latest Fiscal Year	74	155
Originated Four Years before Latest Fiscal Year	57	113
Originated Five or More Years before Latest Fiscal Year	401	551
Total amortized cost basis	693	973
Less than 40 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	11	7
Originated in Fiscal Year before Latest Fiscal Year	8	23
Originated Two Years before Latest Fiscal Year	48	80
Originated Three Years before Latest Fiscal Year	6	99
Originated Four Years before Latest Fiscal Year	58	64
Originated Five or More Years before Latest Fiscal Year	478	895
Total amortized cost basis	$ 609	$ 1,168

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

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