Equity (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		69 Months Ended
	Feb. 19, 2016	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ 6,171	$ 7,325
Net income		74	254
Total foreign currency translation adjustment, net of income tax		128	(421)
Total change in derivative fair value, net of income tax		(65)	(60)
Total pension adjustments, net of income tax		3	5
Cumulative Effect of New Accounting Principle in Period of Adoption		0	(5)	$ 0
Contributions from noncontrolling interests		28	67
Distributions to noncontrolling interests		(19)	(19)
Disposition of businesses		(2)	0
Purchase of treasury stock		(79)	(35)	(1,900)
Issuance and exercise of stock-based compensation benefit plans, net of income tax		4	5
Dividends declared on common stock		(71)	0
Sale of subsidiary shares to noncontrolling interests		17	(81)
Acquisition of subsidiary shares from noncontrolling interests		(5)	0
Ending Balance		$ 6,184	$ 7,035	6,184
Common Stock, Dividends, Per Share, Declared	$ 0.11	$ 0.11	$ 0.00
Common Stock, Dividends, Per Share, Cash Paid		$ 0.11
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total foreign currency translation adjustment, net of income tax		$ 100
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		3,149	$ 4,272
Net income		126	142
Total foreign currency translation adjustment, net of income tax		100	(251)
Total change in derivative fair value, net of income tax		(25)	(26)
Total pension adjustments, net of income tax		1	1
Cumulative Effect of New Accounting Principle in Period of Adoption		0	(5)	0
Contributions from noncontrolling interests		0	0
Distributions to noncontrolling interests		(2)	0
Disposition of businesses		0	0
Purchase of treasury stock		(79)	(35)
Issuance and exercise of stock-based compensation benefit plans, net of income tax		4	5
Dividends declared on common stock		(71)	0
Sale of subsidiary shares to noncontrolling interests		0	(81)
Acquisition of subsidiary shares from noncontrolling interests		(2)	0
Ending Balance		3,201	4,022	3,201
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		3,022	3,053
Net income		(52)	112
Total foreign currency translation adjustment, net of income tax		28	(170)
Total change in derivative fair value, net of income tax		(40)	(34)
Total pension adjustments, net of income tax		2	4
Cumulative Effect of New Accounting Principle in Period of Adoption		0	0	0
Contributions from noncontrolling interests		28	67
Distributions to noncontrolling interests		(17)	(19)
Disposition of businesses		(2)	0
Purchase of treasury stock		0	0
Issuance and exercise of stock-based compensation benefit plans, net of income tax		0	0
Dividends declared on common stock		0	0
Sale of subsidiary shares to noncontrolling interests		17	0
Acquisition of subsidiary shares from noncontrolling interests		(3)	0
Ending Balance		$ 2,983	$ 3,013	$ 2,983