Basis of Presentation and Significant Accounting Policies and Practices - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Basic EPS:
Net income	$ 5,001	$ 4,799	$ 6,510
Income allocated to RSUs	(28)	(24)	(34)
Income allocated to common stock for basic EPS	$ 4,973	$ 4,775	$ 6,476
Weighted average number of shares outstanding, basic (in shares)	909	912	908
Basic earnings per common share (in dollars per share)	$ 5.47	$ 5.24	$ 7.13
Dilutive effect of stock compensation plans (in shares)	4	7	8
Diluted EPS:
Net income	$ 5,001	$ 4,799	$ 6,510
Income allocated to RSUs	(28)	(24)	(33)
Income allocated to common stock for diluted EPS	$ 4,973	$ 4,775	$ 6,477
Weighted average number of shares outstanding, diluted (in shares)	913	919	916
Diluted earnings per common share (in dollars per share)	$ 5.45	$ 5.20	$ 7.07