Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues	$ 4,906	$ 4,585	$ 9,732	$ 8,986
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	3,119	2,863	6,216	5,627
Selling, general and administrative expenses	883	881	1,745	1,708
Depreciation and amortization expense	144	145	287	286
Income from operations	760	696	1,484	1,365
Other income (expense), net:
Interest income	9	7	15	16
Interest expense	(3)	(2)	(5)	(4)
Foreign currency exchange gains (losses), net	(4)	(7)	(4)	(16)
Other, net	(1)	0	0	(2)
Total other income (expense), net	1	(2)	6	(6)
Income before provision for income taxes	761	694	1,490	1,359
Provision for income taxes	(184)	(184)	(354)	(344)
Income (Loss) from Equity Method Investments	0	2	4	2
Net income	$ 577	$ 512	$ 1,140	$ 1,017
Basic earnings per share (usd per share)	$ 1.11	$ 0.97	$ 2.18	$ 1.93
Diluted earnings per share (usd per share)	$ 1.11	$ 0.97	$ 2.18	$ 1.92
Weighted average number of common shares outstanding - Basic (shares)	520	527	522	528
Dilutive effect of shares issuable under stock-based compensation plans (shares)	1	1	1	1
Weighted average number of common shares outstanding - Diluted (shares)	521	528	523	529