Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative effect of change in accounting principle related to leases	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings Cumulative effect of change in accounting principle related to leases
Beginning Balance (in shares) at Dec. 31, 2018			491
Beginning Balance at Dec. 31, 2018	$ 43,549	$ 7	$ 5	$ (1,837)	$ 26,791	$ (1,035)	$ 19,625	$ 7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,588						11,588
Other comprehensive income (loss)	49					49
Stock-based compensation and issuance of employee benefit plan stock (in shares)			7
Stock-based compensation and issuance of employee benefit plan stock	6,867				6,867
Ending Balance (in shares) at Dec. 31, 2019			498
Ending Balance at Dec. 31, 2019	62,060		$ 5	(1,837)	33,658	(986)	31,220
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,331						21,331
Other comprehensive income (loss)	806					806
Stock-based compensation and issuance of employee benefit plan stock (in shares)			5
Stock-based compensation and issuance of employee benefit plan stock	9,207				9,207
Ending Balance (in shares) at Dec. 31, 2020			503
Ending Balance at Dec. 31, 2020	93,404		$ 5	(1,837)	42,865	(180)	52,551
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,364						33,364
Other comprehensive income (loss)	(1,196)					(1,196)
Stock-based compensation and issuance of employee benefit plan stock (in shares)			6
Stock-based compensation and issuance of employee benefit plan stock	12,673				12,673
Ending Balance (in shares) at Dec. 31, 2021			509
Ending Balance at Dec. 31, 2021	$ 138,245		$ 5	$ (1,837)	$ 55,538	$ (1,376)	$ 85,915