Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 4,585	$ 4,000	$ 8,986	$ 8,225
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	2,863	2,615	5,627	5,362
Selling, general and administrative expenses	881	711	1,708	1,422
Depreciation and amortization expense	145	136	286	269
Income from operations	696	467	1,365	1,046
Other income (expense), net:
Interest income	7	37	16	78
Interest expense	(2)	(9)	(4)	(15)
Foreign currency exchange gains (losses), net	(7)	(2)	(16)	(104)
Other, net	0	2	(2)	0
Total other income (expense), net	(2)	28	(6)	(41)
Income before provision for income taxes	694	495	1,359	1,005
Provision for income taxes	(184)	(134)	(344)	(276)
Income (Loss) from Equity Method Investments	2	0	2	(1)
Net income	$ 512	$ 361	$ 1,017	$ 728
Basic earnings per share (usd per share)	$ 0.97	$ 0.67	$ 1.93	$ 1.34
Diluted earnings per share (usd per share)	$ 0.97	$ 0.67	$ 1.92	$ 1.34
Weighted average number of common shares outstanding - Basic (shares)	527	541	528	543
Dilutive effect of shares issuable under stock-based compensation plans (shares)	1	0	1	1
Weighted average number of common shares outstanding - Diluted (shares)	528	541	529	544
Restructuring Charges	$ 0	$ 71	$ 0	$ 126