Condensed Consolidated Statements of Changes in Equity Statement - USD ($) shares in Millions, $ in Millions		Total	Common Stock [Member]	Treasury Stock, Common [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2017			$ 8	$ (1,892)	$ 8,501	$ (2,276)	$ (1,876)	$ 2,380
Beginning Balance (Shares) at Dec. 31, 2017			816.3	155.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 777	$ 0	$ 0	0	684	0	98
Total foreign currency translation adjustment, net of income tax		9	0	0	0	0	3	6
Total change in derivative fair value, net of income tax		67	0	0	0	0	44	23
Total pension adjustments, net of income tax		2	0	0	0	0	2	0
OTHER COMPREHENSIVE INCOME (LOSS)		$ 78					49	29
Fair Value Adjustment	[1]		0	0	(6)	0	0	0
Disposition of business interests	[2]		0	0	0	0	0	(249)
Distributions to noncontrolling interests			0	0	0	0	0	(9)
Contributions from noncontrolling interests			0	0	0	0	0	1
Dividends declared on common stock			$ 0	$ 0	(86)	0	0	0
Common Stock, Dividends, Per Share, Declared		$ 0.13
Issuance and exercise of stock-based compensation benefit plans (Shares)			0.0	(1.0)
Issuance and exercise of stock-based compensation benefit plans, net of income tax			$ 0	$ (13)	(12)	0	0	0
Sale of subsidiary shares to noncontrolling interests			$ 0	$ 0	0	0	0	1
Ending Balance (Shares) at Mar. 31, 2018			816.3	154.9
Ending Balance at Mar. 31, 2018			$ 8	$ (1,879)	8,397	(1,525)	(1,808)	2,332
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	[3]		0	0	0	67	19	81
Beginning Balance at Dec. 31, 2018		$ 5,604	$ 8	$ (1,878)	8,154	(1,005)	(2,071)	2,396
Beginning Balance (Shares) at Dec. 31, 2018			817.2	154.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		233	$ 0	$ 0	0	154	0	81
Total foreign currency translation adjustment, net of income tax		(1)	0	0	0	0	4	(5)
Total change in derivative fair value, net of income tax		(58)	0	0	0	0	(37)	(18)
Total pension adjustments, net of income tax		1	0	0	0	0	1	0
OTHER COMPREHENSIVE INCOME (LOSS)		$ (58)					(32)	(23)
Fair Value Adjustment	[4]		0	0	(6)	0	0	0
Distributions to noncontrolling interests			0	0	0	0	0	(40)
Dividends declared on common stock			$ 0	$ 0	(91)	0	0	0
Common Stock, Dividends, Per Share, Declared		$ 0.1365
Issuance and exercise of stock-based compensation benefit plans (Shares)			0.4	(1.0)
Issuance and exercise of stock-based compensation benefit plans, net of income tax			$ 0	$ (11)	(17)	0	0	0
Sale of subsidiary shares to noncontrolling interests			$ 0	$ 0	(1)	0	0	1
Ending Balance (Shares) at Mar. 31, 2019			817.6	153.9
Ending Balance at Mar. 31, 2019		$ 5,649	$ 8	$ (1,867)	8,039	(839)	(2,107)	2,415
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	[5]		$ 0	$ 0	$ 0	$ 12	$ (4)	$ 0

[1] (2)  Adjustment to record the redeemable stock of Colon at fair value.

[2] (3) See Note 18—Held-for-Sale and Dispositions for further information.

[3] See Note 1—Financial Statement Presentation—New Accounting Standards Adopted for further information

[4] (2)  Adjustment to record the redeemable stock of Colon at fair value.

[5] (1)  See Note 1—Financial Statement Presentation—New Accounting Standards Adopted for further information.