Derivative Instruments - Maturity of the Notional Amounts of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Less Than 1 Year	$ 191,502
1 - 5 Years	74,814
6 - 10 Years	34,884
11 - 30 Years	27,403
Over 30 Years	2,220
Total	330,823	$ 274,575
Interest rate contracts
Derivative [Line Items]
Less Than 1 Year	21,508
1 - 5 Years	17,291
6 - 10 Years	22,513
11 - 30 Years	25,635
Over 30 Years	0
Total	86,947
Foreign currency contracts
Derivative [Line Items]
Less Than 1 Year	245
1 - 5 Years	1,380
6 - 10 Years	1,808
11 - 30 Years	1,761
Over 30 Years	42
Total	5,236
Equity market contracts
Derivative [Line Items]
Less Than 1 Year	169,749
1 - 5 Years	56,126
6 - 10 Years	10,563
11 - 30 Years	7
Over 30 Years	2,178
Total	238,623
Credit contracts
Derivative [Line Items]
Less Than 1 Year	0
1 - 5 Years	17
6 - 10 Years	0
11 - 30 Years	0
Over 30 Years	0
Total	$ 17