Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended				51 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				$ 7,651		$ 7,514
Net income	508		223	849		755
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(1)		0	(1)		0
Total foreign currency translation adjustment, net of income tax	(333)		(6)	(351)		(223)
Total change in derivative fair value, net of income tax	8		34	(185)		205
Total pension adjustments, net of income tax	5		12	36		39
accumulated other comprehensive income reclassed to other noncurrent assets	40	[1]		40	[1]			40	[1]
Capital contributions from noncontrolling interests				131		86
Distributions to noncontrolling interests				(380)		(382)
Disposition of businesses				(152)		(20)
Acquisition of treasury stock	(108.0)			(140.0)		(63.0)		(1,100.0)
Issuance and exercise of stock-based compensation benefit plans, net of income tax				23		39
Dividends declared on common stock (2)				(72)	[2]	(60)	[2]
Sale of subsidiary shares to noncontrolling interests	130			130		83
Acquisition of subsidiary shares from noncontrolling interests				(13)		(7)
Ending Balance	7,566		7,966	7,566		7,966		7,566
Common Stock, Dividends, Per Share, Declared	$ 0.05		$ 0	$ 0.10		$ 0.08
Unrealized Derivative Losses [Roll Forward]
Unrealized derivative losses, beginning balance				(307)
Unrealized derivative losses, ending balance	(367)			(367)				(367)
Unfunded PensionObligation [Roll Forward]
Unfunded pension obligation, beginning balance				(291)
Unfunded pension obligation, ending balance	(276)			(276)				(276)
Foreign Currency Translation Adjustment [Roll Forward]
Foreign currency translation adjustment, beginning balance				(2,284)
Foreign currency translation adjustment, ending balance	(2,532)			(2,532)				(2,532)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(1)		0	(1)		0
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Accumulated other comprehensive loss, beginning balance				(2,882)
Other comprehensive income before reclassifications				(342)
Amounts reclassified from accumulated other comprehensive loss				(8)
Accumulated other comprehensive loss, ending balance	(3,176)			(3,176)				(3,176)
Other comprehensive income, before balance sheet reclassification				(334)
Other Comprehensive Income, Balance Sheet Reclassification				40	[3]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Other comprehensive income before reclassifications				(131)
Amounts reclassified from accumulated other comprehensive loss				(52)
Other comprehensive income, before balance sheet reclassification				(79)
Other Comprehensive Income, Balance Sheet Reclassification				19	[3]
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Other comprehensive income before reclassifications				(218)
Amounts reclassified from accumulated other comprehensive loss				51
Other comprehensive income, before balance sheet reclassification				(269)
Other Comprehensive Income, Balance Sheet Reclassification				21	[3]
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Other comprehensive income before reclassifications				8
Amounts reclassified from accumulated other comprehensive loss				(7)
Other comprehensive income, before balance sheet reclassification				15
Other Comprehensive Income, Balance Sheet Reclassification				0	[3]
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				4,330		4,569
Net income				563		320
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax				(1)		0
Total foreign currency translation adjustment, net of income tax				(269)		(158)
Total change in derivative fair value, net of income tax				(79)		151
Total pension adjustments, net of income tax				15		9
accumulated other comprehensive income reclassed to other noncurrent assets	40	[1]		40	[1]			40	[1]
Capital contributions from noncontrolling interests				0		0
Distributions to noncontrolling interests				0		0
Disposition of businesses				0		0
Acquisition of treasury stock				(140.0)		(63.0)
Issuance and exercise of stock-based compensation benefit plans, net of income tax				23		39
Dividends declared on common stock (2)				(72)	[2]	(60)	[2]
Sale of subsidiary shares to noncontrolling interests				0		12
Acquisition of subsidiary shares from noncontrolling interests				(13)		(6)
Ending Balance	4,397		4,813	4,397		4,813		4,397
Foreign Currency Translation Adjustment [Roll Forward]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax				(1)		0
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				3,321		2,945
Net income				286		435
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax				0		0
Total foreign currency translation adjustment, net of income tax				(82)		(65)
Total change in derivative fair value, net of income tax				(106)		54
Total pension adjustments, net of income tax				21		30
accumulated other comprehensive income reclassed to other noncurrent assets	0	[1]		0	[1]			0	[1]
Capital contributions from noncontrolling interests				131		86
Distributions to noncontrolling interests				(380)		(382)
Disposition of businesses				(152)		(20)
Acquisition 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 (2)				0	[2]	0	[2]
Sale of subsidiary shares to noncontrolling interests				130		71
Acquisition of subsidiary shares from noncontrolling interests				0		(1)
Ending Balance	3,169		3,153	3,169		3,153		3,169
Foreign Currency Translation Adjustment [Roll Forward]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax				0		0
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Other comprehensive income before reclassifications				(1)
Amounts reclassified from accumulated other comprehensive loss				0
Other comprehensive income, before balance sheet reclassification				(1)
Other Comprehensive Income, Balance Sheet Reclassification				$ 0	[3]

[1] (1) Reclassification resulting from Silver Ridge Power transaction. See Note 7 — Investments In and Advances to Affiliates for further information.

[2] (2) Dividends price per share was $0.10 and $0.08 as of September 30, 2014 and September 30, 2013, respectively.

[3] (1) Reclassification resulting from Silver Ridge transaction. See Note 7 — Investments In and Advances to Affiliates for further information.