Mortgage Loans - Credit Quality Indicators - MF (Details) - Multifamily - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 41,281	$ 59,007
2021	66,089	80,197
2020	77,401	66,566
2019	63,207	57,666
2018	52,250	48,128
Prior	121,353	94,641
Total mortgage loans	421,581	406,205
Total mortgage loans (Less than in 2021)	421,581	406,205
Non-classified
Financing Receivable, Credit Quality Indicator [Line Items]
2022	41,215	58,986
2021	65,917	79,602
2020	76,340	64,278
2019	60,824	55,552
2018	50,069	44,037
Prior	109,463	87,549
Total mortgage loans	403,828	390,004
Total mortgage loans (Less than in 2021)	403,828	390,004
Classified
Financing Receivable, Credit Quality Indicator [Line Items]
2022	66	21
2021	172	595
2020	1,061	2,288
2019	2,383	2,114
2018	2,181	4,091
Prior	11,890	7,092
Total mortgage loans	17,753	16,201
Total mortgage loans (Less than in 2021)	17,753	16,201
Substandard or doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total mortgage loans	15	1
Total mortgage loans (Less than in 2021)	$ 15	$ 1