Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2015		$ 16	$ (1,717)	$ 16,860	$ (8,927)	$ 88
Balance (Shares) at Dec. 31, 2015		1,594,213,786
Net income (loss)	$ 347				347
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(25)					(25)
Net change in derivative financial instruments						(45)
Available-for-sale securities						(6)
Defined benefit pensions and other items	11					(11)
Impact of stock-based compensation plans, net of tax (Shares)		15,457,031
Stock Issued During Period, Value, New Issues
Impact of stock-based compensation plans, net of tax				153
Balance (Shares) at Dec. 31, 2016		1,609,670,817
Balance at Dec. 31, 2016		$ 16	(1,717)	17,014	(8,581)	1
Other comprehensive income (loss), net of tax
Rounding				1	(1)
Net income (loss)	104				104
Foreign currency translation adjustment	48					48
Net change in derivative financial instruments						(106)
Available-for-sale securities						5
Defined benefit pensions and other items	$ 6					(6)
Impact of stock-based compensation plans, net of tax (Shares)		11,392,081
Stock Issued During Period, Value, New Issues
Impact of stock-based compensation plans, net of tax				147
Balance (Shares) at Dec. 31, 2017	1,621,062,898	1,621,062,898
Balance at Dec. 31, 2017	$ 7,012	$ 16	(1,717)	17,161	(8,390)	(59)
Cumulative effect adjustment for ASU Adoptions(1) | Accounting Standards Update 2016-09 [Member]	86
Net income (loss)	1,671				1,671
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(21)					(21)
Net change in derivative financial instruments						110
Available-for-sale securities						0
Defined benefit pensions and other items	$ (2)					2
Impact of stock-based compensation plans, net of tax (Shares)		11,085,132
Stock Issued During Period, Value, New Issues
Impact of stock-based compensation plans, net of tax				185
Balance (Shares) at Dec. 31, 2018	1,632,148,030	1,632,148,030
Balance at Dec. 31, 2018	$ 8,726	$ 16	$ (1,717)	$ 17,346	$ (6,953)	$ 33