Financing Receivables - Credit Quality - Commercial Mortgage Loans by LTV Ratio and Year of Origination (Details) - Commercial Loans - Commercial mortgage loans - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	$ 136	$ 134
Originated in Fiscal Year before Latest Fiscal Year	124	262
Originated Two Years before Latest Fiscal Year	233	195
Originated Three Years before Latest Fiscal Year	117	289
Originated Four Years before Latest Fiscal Year	177	230
Originated Five or More Years before Latest Fiscal Year	1,114	1,615
Total amortized cost basis	1,901	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	30	10
Total amortized cost basis	60	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	14	16
Originated Two Years before Latest Fiscal Year	9	12
Originated Three Years before Latest Fiscal Year	6	3
Originated Four Years before Latest Fiscal Year		7
Originated Five or More Years before Latest Fiscal Year	37	15
Total amortized cost basis	75	68
60 to 80 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	95	89
Originated in Fiscal Year before Latest Fiscal Year	69	166
Originated Two Years before Latest Fiscal Year	68	27
Originated Three Years before Latest Fiscal Year	29	32
Originated Four Years before Latest Fiscal Year	61	46
Originated Five or More Years before Latest Fiscal Year	133	144
Total amortized cost basis	455	504
40 to 60 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	23	23
Originated in Fiscal Year before Latest Fiscal Year	34	57
Originated Two Years before Latest Fiscal Year	95	74
Originated Three Years before Latest Fiscal Year	69	155
Originated Four Years before Latest Fiscal Year	60	113
Originated Five or More Years before Latest Fiscal Year	420	551
Total amortized cost basis	701	973
Less than 40 Percent
Amortized cost basis by year of origination and loan-to-value ratio
Originated in Current Fiscal Year	9	7
Originated in Fiscal Year before Latest Fiscal Year	7	23
Originated Two Years before Latest Fiscal Year	41	80
Originated Three Years before Latest Fiscal Year	3	99
Originated Four Years before Latest Fiscal Year	56	64
Originated Five or More Years before Latest Fiscal Year	494	895
Total amortized cost basis	$ 610	$ 1,168

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

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