Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2016		477
Beginning Balance at Dec. 31, 2016	$ 19,285	$ 5	$ (1,837)	$ 17,186	$ (985)	$ 4,916
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,033					3,033
Other comprehensive income (loss)	501				501
Exercise of common stock options		7
Exercise of common stock options	1			1
Stock-based compensation and issuance of employee benefit plan stock	4,202			4,202
Ending Balance (in shares) at Dec. 31, 2017		484
Ending Balance at Dec. 31, 2017	27,709	$ 5	(1,837)	21,389	(484)	8,636
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of a change in accounting principle	687					687
Net income	10,073					10,073
Other comprehensive income (loss)	(547)				(547)
Exercise of common stock options		7
Exercise of common stock options	0			0
Stock-based compensation and issuance of employee benefit plan stock	5,402			5,402
Ending Balance (in shares) at Dec. 31, 2018		491
Ending Balance at Dec. 31, 2018	43,549	$ 5	(1,837)	26,791	(1,035)	19,625
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of a change in accounting principle	912				(4)	916
Net income	11,588					11,588
Other comprehensive income (loss)	49				49
Exercise of common stock options		7
Exercise of common stock options	0			0
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]
Cumulative effect of a change in accounting principle	$ 7				$ 0	$ 7