CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 407	$ 1,035
Adjustments:
Provision for transaction losses	72	62
Depreciation and amortization	179	163
Stock-based compensation	120	101
Deferred income taxes	(29)	(565)
Changes in assets and liabilities, and other, net of acquisition effects	(254)	(214)
Net cash provided by operating activities	495	582
Cash flows from investing activities:
Purchases of property and equipment	(158)	(135)
Purchases of investments	(4,794)	(2,750)
Maturities and sales of investments	6,650	2,770
Other	0	1
Net cash provided by (used in) investing activities	1,698	(114)
Cash flows from financing activities:
Proceeds from issuance of common stock	9	11
Repurchases of common stock	(1,009)	(410)
Tax withholdings related to net share settlements of restricted stock units and awards	(60)	(29)
Repayment of debt	(750)	0
Other	(15)	10
Net cash used in financing activities	(1,825)	(418)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	38	114
Net increase (decrease) in cash and cash equivalents	406	164
Cash and cash equivalents at beginning of period	2,140	1,835
Cash, cash equivalents and restricted cash at end of period	2,546	1,999
Supplemental cash flow disclosures:
Cash paid for interest	117	109
Cash paid for income taxes	$ 77	$ 45