Derivative Instruments - Maturity of the Notional Amounts of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	$ 242,582
1 - 5 Years	59,817
6 - 10 Years	35,868
11 - 30 Years	29,348
Over 30 Years	2,063
Total	369,678	$ 274,575
Interest rate contracts
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	17,128
1 - 5 Years	18,734
6 - 10 Years	23,297
11 - 30 Years	27,489
Over 30 Years	0
Total	86,648
Foreign currency contracts
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	283
1 - 5 Years	1,326
6 - 10 Years	1,778
11 - 30 Years	1,852
Over 30 Years	42
Total	5,281
Equity market contracts
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	225,171
1 - 5 Years	39,756
6 - 10 Years	10,793
11 - 30 Years	7
Over 30 Years	2,021
Total	277,748
Credit contracts
Maturity of the notional amounts of derivative financial instruments
Less Than 1 Year	0
1 - 5 Years	1
6 - 10 Years	0
11 - 30 Years	0
Over 30 Years	0
Total	$ 1