Equity (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended			6 Months Ended		69 Months Ended
		Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 6,171		$ 6,171	$ 7,325
Net income (loss)		$ (387)		$ 264	(313)	518
Total foreign currency translation adjustment, net of income tax		120		77	248	(344)
Total change in derivative fair value, net of income tax		(90)		89	(155)	29
Total pension adjustments, net of income tax		4		4	7	9
Cumulative Effect of New Accounting Principle in Period of Adoption		0		(5)	0	(5)
Contributions from noncontrolling interests					12	97
Distributions to noncontrolling interests					(189)	(119)
Noncontrolling Interest, Increase from Business Combination	[1]				0	16
Disposition of businesses					18	0
Purchase of treasury stock					(79)	(307)	$ (1,900)
Issuance and exercise of stock-based compensation benefit plans, net of income tax					12	17
Dividends declared on common stock					(71)	(70)
Sale of subsidiary shares to noncontrolling interests					17	(82)
Acquisition of subsidiary shares from noncontrolling interests					(5)	0
Ending Balance		$ 5,673		$ 7,084	$ 5,673	$ 7,084
Common Stock, Dividends, Per Share, Declared		$ 0.00		$ 0.10	$ 0.11	$ 0.10
Common Stock, Dividends, Per Share, Cash Paid		$ 0.11	$ 0.11
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total foreign currency translation adjustment, net of income tax					$ 193
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 3,149		3,149	$ 4,272
Net income (loss)					(356)	211
Total foreign currency translation adjustment, net of income tax					193	(204)
Total change in derivative fair value, net of income tax					(80)	30
Total pension adjustments, net of income tax					2	2
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 0		$ (5)	0	(5)
Contributions from noncontrolling interests					0	0
Distributions to noncontrolling interests					(2)	0
Noncontrolling Interest, Increase from Business Combination	[1]				0	0
Disposition of businesses					0	0
Purchase of treasury stock					(79)	(307)
Issuance and exercise of stock-based compensation benefit plans, net of income tax					12	17
Dividends declared on common stock					(71)	(70)
Sale of subsidiary shares to noncontrolling interests					0	(82)
Acquisition of subsidiary shares from noncontrolling interests					(2)	0
Ending Balance		2,766		3,864	2,766	3,864
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 3,022		3,022	3,053
Net income (loss)					43	307
Total foreign currency translation adjustment, net of income tax					55	(140)
Total change in derivative fair value, net of income tax					(75)	(1)
Total pension adjustments, net of income tax					5	7
Cumulative Effect of New Accounting Principle in Period of Adoption		0		0	0	0
Contributions from noncontrolling interests					12	97
Distributions to noncontrolling interests					(187)	(119)
Noncontrolling Interest, Increase from Business Combination	[1]				0	16
Disposition of businesses					18	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		$ 2,907		$ 3,220	$ 2,907	$ 3,220

[1] (1) Fair value of a tax equity partner’s right to preferential returns as a result of the acquisition of Solar Power PR, LLC (Solar Puerto Rico), which was previously accounted for as an equity method investment.