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, 2024	Dec. 31, 2023	Dec. 31, 2022
Basic EPS:
Net income	$ 4,799	$ 6,510	$ 8,749
Income allocated to RSUs	(24)	(34)	(40)
Income allocated to common stock for basic EPS	$ 4,775	$ 6,476	$ 8,709
Weighted average number of shares outstanding, basic (in shares)	912	908	916
Basic earnings per common share (in dollars per share)	$ 5.24	$ 7.13	$ 9.51
Dilutive effect of stock compensation plans	7	8	10
Diluted EPS:
Net income	$ 4,799	$ 6,510	$ 8,749
Income allocated to RSUs	(24)	(33)	(39)
Income allocated to common stock for diluted EPS	$ 4,775	$ 6,477	$ 8,710
Weighted average number of shares outstanding, diluted (in shares)	919	916	926
Diluted earnings per common share (in dollars per share)	$ 5.20	$ 7.07	$ 9.41