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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Gain resulting from observable price changes	$ 0	$ 0	$ 0	$ 4
Positive adjustments, cumulative amount	23		23
Private equity, impairment	13	0	13	0
Private equity, cumulative impairment	28		28
Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value changes included in earnings for residential mortgage for which the fair value option was elected	(12)	$ (7)	(35)	$ (9)
Credit risk of fair value option			0		$ 0
Commercial
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value changes included in earnings for residential mortgage for which the fair value option was elected	$ 0		0
Credit risk of fair value option			$ 0