Consolidated Statement of Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Accumulated Deficit	Accumulated Other Comprehensive Loss	Common Stock Held in Treasury	Total Stockholder's Equity	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2017		1,578				130
Balance at Dec. 31, 2017	$ 11,296	$ 158	$ 26,751	$ (14,722)	$ (487)	$ (3,723)	$ 7,977	$ 3,319
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)		1				0
Exercised and issued stock-based awards	6	$ 0	6	0	0	$ 0	6	0
Stock-based compensation, including the tender of shares	41	0	44	0	0	$ (3)	41	0
Stock-based compensation, including the tender of shares (in shares)						0
Dividends	(245)	$ 0	(72)		0	$ 0	(72)	173
Tender of shares for stock based awards shares		0				0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			0		0
Net income attributable to common stockholders	692	$ 0		692		$ 0	692	0
Net income attributable to noncontrolling interests	(125)	0				0	0	(125)
Noncontrolling Interest, Change in Redemption Value			0	0	0
Other comprehensive income	11	$ 0	0		12	$ 0	12	(1)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	828			0
Balance (in shares) at Mar. 31, 2018		1,579				130
Balance at Mar. 31, 2018	$ 11,926	$ 158	$ 26,729	$ (14,030)	$ (475)	$ (3,726)	$ 8,656	$ 3,270