Stockholders' Equity - Changes in Stockholders Equity (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Changes in Stockholders' Equity
Beginning balance	$ 134,001	$ 138,245	$ 103,320	$ 93,404	$ 138,245	$ 93,404	$ 114,803
Common stock repurchased					(6,000)
Other comprehensive income (loss)	(2,417)		141		(3,406)	(345)
Net income (loss)	(2,028)		7,778		(5,872)	15,885	11,607	$ 29,438
Ending balance	131,402	134,001	114,803	103,320	131,402	114,803	131,402	114,803
Common stock
Changes in Stockholders' Equity
Beginning balance	107	106	106	105	106	105	106
Stock-based compensation and issuance of employee benefit plan stock	0		0		1	1
Ending balance	107	107	106	106	107	106	107	106
Treasury stock
Changes in Stockholders' Equity
Beginning balance	(4,503)	(1,837)	(1,837)	(1,837)	(1,837)	(1,837)	(1,837)
Common stock repurchased	(3,334)		0		(6,000)	0
Ending balance	(7,837)	(4,503)	(1,837)	(1,837)	(7,837)	(1,837)	(7,837)	(1,837)
Additional paid-in capital
Changes in Stockholders' Equity
Beginning balance	58,691	55,437	45,060	42,765	55,437	42,765	48,623
Stock-based compensation and issuance of employee benefit plan stock	5,180		3,563		8,434	5,858
Ending balance	63,871	58,691	48,623	45,060	63,871	48,623	63,871	48,623
Accumulated other comprehensive income (loss)
Changes in Stockholders' Equity
Beginning balance	(2,365)	(1,376)	(666)	(180)	(1,376)	(180)	(525)
Other comprehensive income (loss)	(2,417)		141		(3,406)	(345)
Ending balance	(4,782)	(2,365)	(525)	(666)	(4,782)	(525)	(4,782)	(525)
Retained earnings
Changes in Stockholders' Equity
Beginning balance	82,071	85,915	60,658	52,551	85,915	52,551	68,436
Net income (loss)	(2,028)		7,778		(5,872)	15,885
Ending balance	$ 80,043	$ 82,071	$ 68,436	$ 60,658	$ 80,043	$ 68,436	$ 80,043	$ 68,436