CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income		$ 1,813	$ 273	$ 966
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes		20	(181)	(9)
Provision for inventories		6	33	42
Depreciation and amortization		509	888	829
Amortization of capitalized software development costs and intellectual property licenses	[1]	489	311	321
Loss on extinguishment of debt (Note 13)		40	12	92
Amortization of debt discount and financing costs		6	12	21
Share-based compensation expense	[2]	209	176	147
Other		1	28	4
Changes in operating assets and liabilities, net of effect from business acquisitions:
Accounts receivable, net		(114)	(165)	84
Inventories		(5)	(26)	32
Software development and intellectual property licenses		(372)	(301)	(362)
Other assets		(51)	(97)	(10)
Deferred revenues		(122)	220	(35)
Accounts payable		(65)	85	(50)
Accrued expenses and other liabilities		(574)	945	83
Net cash provided by operating activities		1,790	2,213	2,155
Cash flows from investing activities:
Proceeds from maturities of available-for-sale investments		116	80	0
Purchases of available-for-sale investments		(209)	(135)	0
Acquisition of business, net of cash acquired (see Note 23)		0	0	(4,586)
Capital expenditures		(131)	(155)	(136)
Other investing activities		(6)	3	(7)
Net cash used in investing activities		(230)	(207)	(4,729)
Cash flows from financing activities:
Proceeds from issuance of common stock to employees		99	178	106
Tax payment related to net share settlements on restricted stock units		(94)	(56)	(115)
Dividends paid		(259)	(226)	(195)
Proceeds from debt issuances, net of discounts		0	3,741	6,878
Repayment of long-term debt		(1,740)	(4,251)	(6,104)
Premium payment for early redemption of note (Note 13)		(25)	0	(63)
Other financing activities		(1)	(10)	(7)
Net cash (used in) provided by financing activities		(2,020)	(624)	500
Effect of foreign exchange rate changes on cash and cash equivalents		(31)	76	(56)
Net increase (decrease) in cash and cash equivalents and restricted cash		(491)	1,458	(2,130)
Cash and cash equivalents and restricted cash at beginning of period		4,720	3,262	5,392
Cash and cash equivalents and restricted cash at end of period		$ 4,229	$ 4,720	$ 3,262

[1] Excludes deferral and amortization of share-based compensation expense.

[2] Includes the net effects of capitalization, deferral, and amortization of share-based compensation expense.