Income Taxes - Schedule of Reconciliation of Federal Statutory Income Tax Rate to Effective Income Tax Rate Current Year (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
U.S. federal statutory tax rate	$ 125	$ 99	$ 122
State and local income taxes, net of federal income tax effect	0
Tax credit		(133)	(47)
Other adjustments		(10)	0
Branch loss	(33)
Foreign currency loss	(14)
Changes in valuation allowance	8	193	(1,031)
Stock compensation	49	56	44
Other	26	17	0
Changes in unrecognized tax benefits	33
Income tax expense (benefit)	$ 383	$ 407	$ (776)
Percent
U.S. federal statutory tax rate	21.00%
State and local income taxes, net of federal income tax effect	0.00%
Branch loss	(5.50%)
Foreign currency loss	(2.30%)
Changes in valuation allowance	1.30%
Stock compensation	8.20%
Other	4.40%
Changes in unrecognized tax benefits	5.50%
Income tax expense	64.20%
Korea
Amount
State and local income taxes, net of federal income tax effect	$ 41
Statutory tax rate difference	46
Effect of changes in tax laws or rates	(34)
Tax credit	(8)
Other adjustments	$ 7
Percent
State and local income taxes, net of federal income tax effect	6.90%
Statutory tax rate difference	7.70%
Effect of changes in tax laws or rates	(5.70%)
Tax credits	(1.30%)
Other adjustments	1.20%
Other foreign jurisdictions
Amount
Statutory tax rate difference	$ 182
Percent
Statutory tax rate difference	30.50%
U.S federal
Amount
Tax credit	$ (38)
Other adjustments	$ (7)
Percent
Tax credits	(6.40%)
Other adjustments	(1.20%)