Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying values of other intangible assets	$ 3,500	$ 3,800
Accumulated amortization for other intangible assets	962	879
Carrying value of finite-lived intangible assets	1,300	1,700
Carrying value of indefinite-lived intangible assets	1,300	1,200
Business Combination [Line Items]
Amortization expense for other intangible assets	$ 292	$ 339
CIFM
Business Combination [Line Items]
Percentage interest acquired			51.00%