Fair Values - Equity Securities Without Readily Determinable Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of equity securities without readily determinable fair values	$ 900	$ 900
Net upward adjustments of equity securities without readily determinable fair values	85	18	$ 94
Net downward adjustments of equity securities without readily determinable fair values	37	142	$ 388
Cumulative net unrealized gains for equity investments without readily determinable fair values	1,100	1,100
Cumulative net unrealized losses for equity investments without readily determinable fair values	460	431
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of equity securities without readily determinable fair values	$ 1	$ 0