Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 4,000	$ 4,141	$ 8,225	$ 8,251
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	2,615	2,629	5,362	5,204
Selling, general and administrative expenses	711	719	1,422	1,590
Depreciation and amortization expense	136	125	269	248
Income from operations	467	619	1,046	1,158
Other income (expense), net:
Interest income	37	45	78	93
Interest expense	(9)	(6)	(15)	(13)
Foreign currency exchange gains (losses), net	(2)	16	(104)	18
Other, net	2	2	0	3
Total other income (expense), net	28	57	(41)	101
Income before provision for income taxes	495	676	1,005	1,259
Provision for income taxes	(134)	(167)	(276)	(309)
Income (Loss) from Equity Method Investments	0	0	(1)	0
Net income	$ 361	$ 509	$ 728	$ 950
Basic earnings per share (usd per share)	$ 0.67	$ 0.90	$ 1.34	$ 1.67
Diluted earnings per share (usd per share)	$ 0.67	$ 0.90	$ 1.34	$ 1.67
Weighted average number of common shares outstanding - Basic (shares)	541	564	543	569
Dilutive effect of shares issuable under stock-based compensation plans (shares)	0	0	1	1
Weighted average number of common shares outstanding - Diluted (shares)	541	564	544	570
Restructuring Charges	$ 71	$ 49	$ 126	$ 51