CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 746	$ 402	$ 4,158	$ 920
(Income) loss from discontinued operations, net of income taxes	(6)	(2)	(2,933)	(4)
Adjustments:
Provision for transaction losses	93	63	195	130
Depreciation and amortization			319	330
Stock-based compensation			216	241
(Gain) loss on investments, net			2	1
Deferred income taxes			104	56
Change in fair value of warrant			(305)	(105)
Changes in assets and liabilities, net of acquisition effects			(90)	(302)
Net cash provided by continuing operating activities			1,666	1,267
Net cash provided by (used in) discontinued operating activities			(110)	27
Net cash provided by operating activities			1,556	1,294
Cash flows from investing activities:
Purchases of property and equipment			(196)	(313)
Purchases of investments			(21,673)	(24,167)
Maturities and sales of investments			19,666	25,827
Acquisitions, net of cash acquired			(42)	(93)
Other			39	49
Net cash provided by (used in) continuing investing activities			(2,206)	1,303
Net cash provided by (used in) discontinued investing activities			4,075	(17)
Net cash provided by investing activities			1,869	1,286
Cash flows from financing activities:
Proceeds from issuance of common stock			50	55
Repurchases of common stock			(4,030)	(2,949)
Payments for taxes related to net share settlements of restricted stock units and awards			(83)	(119)
Payments for dividends	(112)	(120)	(226)	(245)
Proceeds from issuance of long-term debt, net			1,765	0
Repayment of debt			(839)	0
Other			(7)	0
Net cash used in continuing financing activities			(3,370)	(3,258)
Net cash provided by (used in) discontinued financing activities			0	0
Net cash used in financing activities			(3,370)	(3,258)
Effect of exchange rate changes on cash, cash equivalents and restricted cash			(26)	(20)
Net increase (decrease) in cash, cash equivalents and restricted cash			29	(698)
Cash, cash equivalents and restricted cash at beginning of period			996	2,219	$ 2,219
Cash, cash equivalents and restricted cash at end of period	1,025	1,521	1,025	1,521	$ 996
Less: Cash, cash equivalents and restricted cash of discontinued operations	0	20	0	20
Cash, cash equivalents and restricted cash of continuing operations at end of period	$ 1,025	$ 1,501	1,025	1,501
Supplemental cash flow disclosures:
Cash paid for interest			138	154
Cash paid for interest on financial lease obligations			1	0
Cash paid for income taxes			$ 113	$ 220