Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 1,017	$ 728
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	286	273
Deferred income taxes	119	(93)
Stock-based compensation expense	129	120
Other	(2)	187
Changes in assets and liabilities:
Trade accounts receivable	(279)	78
Other current and noncurrent assets	60	171
Accounts payable	17	103
Deferred revenues, current and noncurrent	(34)	19
Other current and noncurrent liabilities	(591)	(110)
Net cash provided by operating activities	722	1,476
Cash flows from investing activities:
Purchases of property and equipment	(163)	(205)
Purchases of available-for-sale investment securities	(105)	0
Purchases of held-to-maturity investment securities	(89)	(202)
Proceeds from maturity of held-to-maturity investment securities	76	346
Purchases of other investments	(642)	(264)
Proceeds from maturity or sale of other investments	322	283
Payments for business combinations, net of cash acquired	(658)	(489)
Net cash (used in) investing activities	(1,259)	(531)
Cash flows from financing activities:
Issuance of common stock under stock-based compensation plans	75	76
Repurchases of common stock	(560)	(585)
Repayment of Term Loan borrowings and finance lease and earnout obligations	(28)	(25)
Proceeds from borrowings under the revolving credit facility	0	1,740
Dividends paid	(255)	(242)
Net cash (used in) provided by financing activities	(768)	964
Effect of exchange rate changes on cash and cash equivalents	(7)	(132)
(Decrease) increase in cash and cash equivalents	(1,312)	1,777
Cash and cash equivalents, beginning of year	2,680	2,645
Cash and cash equivalents, end of period	$ 1,368	$ 4,422