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)
Common stock, beginning balance (in shares) at Dec. 31, 2020		1,203
Treasury stock, beginning balance (in shares) at Dec. 31, 2020			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)
Common stock, ending balance (in shares) at Mar. 31, 2021		1,206
Treasury stock, ending balance (in shares) at Mar. 31, 2021			429
Ending balance at Mar. 31, 2021	15,331	$ 0	$ (5,563)	11,549	9,945	(600)
Common stock, beginning balance (in shares) at Dec. 31, 2020		1,203
Treasury stock, beginning balance (in shares) at Dec. 31, 2020			429
Beginning balance at Dec. 31, 2020	15,037	$ 0	$ (5,563)	11,531	9,691	(622)
Components of comprehensive income:
Net income	1,496
Other comprehensive income (loss)	29
Common stock, ending balance (in shares) at Jun. 30, 2021		1,206
Treasury stock, ending balance (in shares) at Jun. 30, 2021			429
Ending balance at Jun. 30, 2021	16,286	$ 0	$ (5,563)	11,621	10,821	(593)
Common stock, beginning balance (in shares) at Mar. 31, 2021		1,206
Treasury stock, beginning balance (in shares) at Mar. 31, 2021			429
Beginning balance at Mar. 31, 2021	15,331	$ 0	$ (5,563)	11,549	9,945	(600)
Components of comprehensive income:
Net income	876				876
Other comprehensive income (loss)	7					7
Issuance of common stock pursuant to employee stock options (in shares)		0
Issuance of common stock pursuant to employee stock options	33			33
Restricted stock surrendered for employees' tax liability (in shares)		0
Restricted stock surrendered for employees’ tax liability	(7)			(7)
Share-based compensation expense related to employee stock options and restricted stock units	46			46
Common stock, ending balance (in shares) at Jun. 30, 2021		1,206
Treasury stock, ending balance (in shares) at Jun. 30, 2021			429
Ending balance at Jun. 30, 2021	16,286	$ 0	$ (5,563)	11,621	10,821	(593)
Common stock, beginning balance (in shares) at Dec. 31, 2021		1,208
Treasury stock, beginning balance (in shares) at Dec. 31, 2021			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)
Common stock, ending balance (in shares) at Mar. 31, 2022		1,210
Treasury stock, ending balance (in shares) at Mar. 31, 2022			429
Ending balance at Mar. 31, 2022	17,831	$ 0	$ (5,563)	11,927	12,053	(586)
Common stock, beginning balance (in shares) at Dec. 31, 2021		1,208
Treasury stock, beginning balance (in shares) at Dec. 31, 2021			429
Beginning balance at Dec. 31, 2021	17,599	$ 0	$ (5,563)	11,715	12,025	(578)
Components of comprehensive income:
Net income	675
Other comprehensive income (loss)	(13)
Common stock, ending balance (in shares) at Jun. 30, 2022		1,211
Treasury stock, ending balance (in shares) at Jun. 30, 2022			429
Ending balance at Jun. 30, 2022	18,248	$ 0	$ (5,563)	12,069	12,333	(591)
Common stock, beginning balance (in shares) at Mar. 31, 2022		1,210
Treasury stock, beginning balance (in shares) at Mar. 31, 2022			429
Beginning balance at Mar. 31, 2022	17,831	$ 0	$ (5,563)	11,927	12,053	(586)
Components of comprehensive income:
Net income	280				280
Other comprehensive income (loss)	(5)					(5)
Issuance of common stock pursuant to employee stock options (in shares)		1
Issuance of common stock pursuant to employee stock options	22			22
Restricted stock surrendered for employees' tax liability (in shares)		0
Restricted stock surrendered for employees’ tax liability	(9)			(9)
Share-based compensation expense related to employee stock options and restricted stock units	129			129
Common stock, ending balance (in shares) at Jun. 30, 2022		1,211
Treasury stock, ending balance (in shares) at Jun. 30, 2022			429
Ending balance at Jun. 30, 2022	$ 18,248	$ 0	$ (5,563)	$ 12,069	$ 12,333	$ (591)