Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 1,561	$ 1,076
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	430	411
Deferred income taxes	146	290
Stock-based compensation expense	194	178
Other	(1)	107
Changes in assets and liabilities:
Trade accounts receivable	(371)	212
Other current and noncurrent assets	257	96
Accounts payable	(39)	83
Deferred revenues, current and noncurrent	(75)	(36)
Other current and noncurrent liabilities	(432)	(16)
Net cash provided by operating activities	1,670	2,401
Cash flows from investing activities:
Purchases of property and equipment	(214)	(309)
Purchases of available-for-sale investment securities	(400)	0
Proceeds from maturity or sale of available-for-sale investment securities	(105)	0
Purchases of held-to-maturity investment securities	(160)	(202)
Proceeds from maturity of held-to-maturity investment securities	150	373
Purchases of other investments	(1,192)	(446)
Proceeds from maturity or sale of other investments	760	464
Payments for business combinations, net of cash acquired	(715)	(1,069)
Net cash (used in) investing activities	(1,666)	(1,189)
Cash flows from financing activities:
Issuance of common stock under stock-based compensation plans	104	109
Repurchases of common stock	(689)	(833)
Repayment of Term Loan borrowings and finance lease and earnout obligations	(40)	(37)
Proceeds from borrowings under the revolving credit facility	0	1,740
Dividends paid	(382)	(362)
Net cash (used in) provided by financing activities	(1,007)	617
Effect of exchange rate changes on cash and cash equivalents	(13)	(38)
(Decrease) increase in cash and cash equivalents	(1,016)	1,791
Cash and cash equivalents, beginning of year	2,680	2,645
Cash and cash equivalents, end of period	$ 1,664	$ 4,436