Income Taxes - Reconciliation of Statutory to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Statutory corporate tax rate	$ (2,806)	$ (3,103)	$ (2,772)
Nontaxable or nondeductible items	85	72	30
Tax credits	88	111	65
Changes in valuation allowances	3	0	16
Total income tax expense	$ (2,630)	$ (2,920)	$ (2,661)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory corporate tax rate	21.00%	21.00%	21.00%
Nontaxable or nondeductible items	(0.60%)	(0.50%)	(0.20%)
Tax credits	(0.70%)	(0.70%)	(0.50%)
Changes in valuation allowances	0.00%	0.00%	(0.10%)
Effective tax rate	19.70%	19.80%	20.20%