Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 4,225	$ 4,110
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	2,747	2,575
Selling, general and administrative expenses	711	871
Depreciation and amortization expense	133	123
Income from operations	579	539
Other income (expense), net:
Interest income	41	48
Interest expense	(6)	(7)
Foreign currency exchange gains (losses), net	(102)	2
Other, net	(2)	1
Total other income (expense), net	(69)	44
Income before provision for income taxes	510	583
Provision for income taxes	(142)	(142)
Income (Loss) from Equity Method Investments	(1)	0
Net income	$ 367	$ 441
Basic earnings per share (usd per share)	$ 0.67	$ 0.77
Diluted earnings per share (usd per share)	$ 0.67	$ 0.77
Weighted average number of common shares outstanding - Basic (shares)	546	573
Dilutive effect of shares issuable under stock-based compensation plans (shares)	0	2
Weighted average number of common shares outstanding - Diluted (shares)	546	575
Restructuring Charges	$ 55	$ 2