Stockholders' Equity - Changes in Stockholders Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Changes in Stockholders' Equity
Beginning balance	$ 305,867	$ 216,661	$ 285,970	$ 201,875	$ 236,447
Other comprehensive income (loss)	3,334	(395)	2,454	(953)
Net income	18,164	13,485	35,291	23,916	70,623	$ 44,419
Ending balance	333,775	236,447	333,775	236,447	333,775	236,447
Common stock
Changes in Stockholders' Equity
Beginning balance	111	109	111	109	110
Stock-based compensation and issuance of employee benefit plan stock	1	1	1	1
Ending balance	112	110	112	110	112	110
Treasury stock
Changes in Stockholders' Equity
Beginning balance	(7,837)	(7,837)	(7,837)	(7,837)	(7,837)
Ending balance	(7,837)	(7,837)	(7,837)	(7,837)	(7,837)	(7,837)
Additional paid-in capital
Changes in Stockholders' Equity
Beginning balance	124,514	103,938	120,864	99,025	110,633
Stock-based compensation and issuance of employee benefit plan stock	6,409	6,695	10,059	11,608
Ending balance	130,923	110,633	130,923	110,633	130,923	110,633
Accumulated other comprehensive income (loss)
Changes in Stockholders' Equity
Beginning balance	(914)	(3,598)	(34)	(3,040)	(3,993)
Other comprehensive income (loss)	3,334	(395)	2,454	(953)
Ending balance	2,420	(3,993)	2,420	(3,993)	2,420	(3,993)
Retained earnings
Changes in Stockholders' Equity
Beginning balance	189,993	124,049	172,866	113,618	137,534
Net income	18,164	13,485	35,291	23,916
Ending balance	$ 208,157	$ 137,534	$ 208,157	$ 137,534	$ 208,157	$ 137,534