Derivative Instruments - Maturity of the Notional Amounts of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Less Than 1 Year	$ 114,550
1 - 5 Years	83,703
6 - 10 Years	28,246
11 - 30 Years	28,665
Over 30 Years	3,978
Total	259,142	$ 329,918
Interest rate contracts
Derivative [Line Items]
Less Than 1 Year	18,494
1 - 5 Years	26,227
6 - 10 Years	16,603
11 - 30 Years	26,882
Over 30 Years	1,800
Total	90,006
Foreign currency contracts
Derivative [Line Items]
Less Than 1 Year	218
1 - 5 Years	1,657
6 - 10 Years	1,627
11 - 30 Years	1,777
Over 30 Years	42
Total	5,321
Equity market contracts
Derivative [Line Items]
Less Than 1 Year	95,838
1 - 5 Years	55,709
6 - 10 Years	9,887
11 - 30 Years	6
Over 30 Years	2,136
Total	163,576
Credit contracts
Derivative [Line Items]
Less Than 1 Year	0
1 - 5 Years	110
6 - 10 Years	129
11 - 30 Years	0
Over 30 Years	0
Total	$ 239