Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2020		164,477
Beginning balance at Dec. 31, 2020	$ 11,569	$ 2	$ 9,323	$ (1,234)	$ 3,478
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(122)				(122)
Cumulative effect of accounting change on convertible senior notes:
Capped call proceeds	(202)		(230)		28
Issuance fees and deferred taxes	44		50		(6)
Exercise of long-term incentive stock options (in shares)		55
Exercise of long-term incentive plan stock options and employee stock purchases	6		(2)	8
Purchases of treasury stock (in shares)		(99)
Purchases of treasury stock	(13)			(13)
Shares issued or reissued for acquisition (in shares)		51,655
Shares issued or reissued for acquisitions	6,882		5,644	1,238
Stock-based compensation:
Vested compensation awards, net or issued awards (in shares)		623
Vested compensation awards, net	0
Compensation costs included in net income (loss)	19		19
Compensation costs included in net income associated with acquisitions	33		33
Net income (loss)	(70)				(70)
Ending balance (in shares) at Mar. 31, 2021		216,711
Ending balance at Mar. 31, 2021	18,146	$ 2	14,837	(1)	3,308
Beginning balance (in shares) at Dec. 31, 2020		164,477
Beginning balance at Dec. 31, 2020	11,569	$ 2	9,323	(1,234)	3,478
Stock-based compensation:
Net income (loss)	1,355
Ending balance (in shares) at Sep. 30, 2021		244,122
Ending balance at Sep. 30, 2021	23,193	$ 2	19,104	0	4,087
Beginning balance (in shares) at Mar. 31, 2021		216,711
Beginning balance at Mar. 31, 2021	18,146	$ 2	14,837	(1)	3,308
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(138)				(138)
Cumulative effect of accounting change on convertible senior notes:
Purchases of treasury stock (in shares)		(2)
Purchases of treasury stock	(1)			(1)
Shares issued or reissued for acquisition (in shares)		27,187
Shares issued or reissued for acquisitions	4,234		4,234
Stock-based compensation:
Vested compensation awards, net or issued awards (in shares)		63
Vested compensation awards, net	0
Compensation costs included in net income (loss)	17		17
Net income (loss)	380				380
Ending balance (in shares) at Jun. 30, 2021		243,959
Ending balance at Jun. 30, 2021	22,638	$ 2	19,088	(2)	3,550
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(508)				(508)
Cumulative effect of accounting change on convertible senior notes:
Employee stock purchases (in shares)		53
Employee stock purchases	5		(2)	7
Purchases of treasury stock (in shares)		(34)
Purchases of treasury stock	(5)			(5)
Stock-based compensation:
Vested compensation awards, net or issued awards (in shares)		144
Vested compensation awards, net	0
Compensation costs included in net income (loss)	18		18
Net income (loss)	1,045				1,045
Ending balance (in shares) at Sep. 30, 2021		244,122
Ending balance at Sep. 30, 2021	23,193	$ 2	19,104	0	4,087
Beginning balance (in shares) at Dec. 31, 2021		242,778
Beginning balance at Dec. 31, 2021	22,837	$ 2	19,123	(248)	3,960
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(922)				(922)
Cumulative effect of accounting change on convertible senior notes:
Exercise of long-term incentive stock options (in shares)		6
Exercise of long-term incentive plan stock options and employee stock purchases	1			1
Purchases of treasury stock (in shares)		(1,175)
Purchases of treasury stock	(276)			(276)
Stock-based compensation:
Vested compensation awards, net or issued awards (in shares)		350
Vested compensation awards, net	0
Compensation costs included in net income (loss)	19		19
Net income (loss)	2,009				2,009
Ending balance (in shares) at Mar. 31, 2022		241,959
Ending balance at Mar. 31, 2022	23,668	$ 2	19,142	(523)	5,047
Beginning balance (in shares) at Dec. 31, 2021		242,778
Beginning balance at Dec. 31, 2021	22,837	$ 2	19,123	(248)	3,960
Stock-based compensation:
Net income (loss)	6,364
Ending balance (in shares) at Sep. 30, 2022		237,736
Ending balance at Sep. 30, 2022	22,949	$ 2	18,911	(1,525)	5,561
Beginning balance (in shares) at Mar. 31, 2022		241,959
Beginning balance at Mar. 31, 2022	23,668	$ 2	19,142	(523)	5,047
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(1,788)				(1,788)
Cumulative effect of accounting change on convertible senior notes:
Conversion premium	(2)		(2)
Capped call proceeds	26		26
Issuance fees and deferred taxes	(6)		(6)
Purchases of treasury stock (in shares)		(2,126)
Purchases of treasury stock	(499)			(499)
Stock-based compensation:
Vested compensation awards, net or issued awards (in shares)		5
Vested compensation awards, net	0
Compensation costs included in net income (loss)	20		20
Net income (loss)	2,371				2,371
Ending balance (in shares) at Jun. 30, 2022		239,838
Ending balance at Jun. 30, 2022	23,790	$ 2	19,180	(1,022)	5,630
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(2,053)				(2,053)
Cumulative effect of accounting change on convertible senior notes:
Conversion premium	(319)		(319)
Capped call proceeds	45		45
Issuance fees and deferred taxes	(13)		(13)
Employee stock purchases (in shares)		41
Employee stock purchases	6		(2)	8
Purchases of treasury stock (in shares)		(2,338)
Purchases of treasury stock	(511)			(511)
Stock-based compensation:
Vested compensation awards, net or issued awards (in shares)		195
Vested compensation awards, net	0
Compensation costs included in net income (loss)	20		20
Net income (loss)	1,984				1,984
Ending balance (in shares) at Sep. 30, 2022		237,736
Ending balance at Sep. 30, 2022	$ 22,949	$ 2	$ 18,911	$ (1,525)	$ 5,561