Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Statement of Cash Flows [Abstract]
Proceeds from term deposits and sales of available-for-sale investments	$ 0	$ 1,084
Operating activities
Net income	1,090	922
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	470	276
Stock-based compensation	90	79
Deferred taxes	20	(63)
Amortization of Debt Discount (Premium)	0	(23)
Other	2	(16)
Changes in assets and liabilities:
Customer accounts receivable	(88)	(62)
Prepaid expenses and other current assets	(8)	(20)
Income taxes payable	(83)	(106)
Deferred revenue	144	131
Other current and non-current liabilities	(129)	(228)
Total adjustments	418	(32)
Net cash provided by operating activities	1,508	890
Investing activities
Capital expenditures	(166)	(125)
Capitalized software development costs	(88)	(67)
Cash paid for equity method investment	(70)	(60)
Increase in restricted cash and investments	18	14
Net cash provide by (used in) investing activities	(306)	846
Financing activities
Proceeds from (repayments of) commercial paper, net	(1,006)	(681)
Dividends to shareholders	(307)	(242)
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	(51)	(42)
Repurchases of common stock	0	(605)
Distributions of profits to non-controlling interest	(21)	(24)
Proceeds from (Payments for) Other Financing Activities	19	30
Net cash used in financing activities	(1,366)	(1,692)
Effect of exchange rate changes on cash and cash equivalents	(5)	(9)
Net increase (decrease) in cash and cash equivalents	(169)	35
Cash and cash equivalents, beginning of period	627	652
Cash and cash equivalents, end of period	458
Supplemental cash flow disclosure
Cash paid for income taxes	362	419
Cash paid for interest	$ 89	$ 91