CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2020		1,203	429
Beginning balance at Dec. 31, 2020	$ 15,037	$ 0	$ (5,563)	$ 11,531	$ 9,691	$ (622)
Components of comprehensive income:
Net income	619				619
Other comprehensive income (loss)	22					22
Issuance of common stock pursuant to employee stock options (in shares)		1
Issuance of common stock pursuant to employee stock options	33			33
Issuance of common stock pursuant to restricted stock units (in shares)		4
Issuance of common stock pursuant to restricted stock units	0
Restricted stock surrendered for employees' tax liability (in shares)		(2)
Restricted stock surrendered for employees’ tax liability	(165)			(165)
Share-based compensation expense related to employee stock options and restricted stock units	150			150
Dividends	(365)				(365)
Balance (in shares) at Mar. 31, 2021		1,206	429
Ending balance at Mar. 31, 2021	15,331	$ 0	$ (5,563)	11,549	9,945	(600)
Balance (in shares) at Dec. 31, 2021		1,208	429
Beginning balance at Dec. 31, 2021	17,599	$ 0	$ (5,563)	11,715	12,025	(578)
Components of comprehensive income:
Net income	395				395
Other comprehensive income (loss)	(8)					(8)
Issuance of common stock pursuant to employee stock options (in shares)		0
Issuance of common stock pursuant to employee stock options	15			15
Issuance of common stock pursuant to restricted stock units (in shares)		4
Issuance of common stock pursuant to restricted stock units	0
Restricted stock surrendered for employees' tax liability (in shares)		(2)
Restricted stock surrendered for employees’ tax liability	(131)			(131)
Settlement of liability-classified awards in restricted stock units (Note 10)	204			204
Share-based compensation expense related to employee stock options and restricted stock units	124			124
Dividends	(367)				(367)
Balance (in shares) at Mar. 31, 2022		1,210	429
Ending balance at Mar. 31, 2022	$ 17,831	$ 0	$ (5,563)	$ 11,927	$ 12,053	$ (586)