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Note 7. Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 19 years  
Finite-Lived Intangible Assets, Accumulated Amortization $ (121)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ (115)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total other intangible assets, Gross 1,746us-gaap_IntangibleAssetsGrossExcludingGoodwill 701us-gaap_IntangibleAssetsGrossExcludingGoodwill
Total other intangible assets, Net 1,625us-gaap_IntangibleAssetsNetExcludingGoodwill 586us-gaap_IntangibleAssetsNetExcludingGoodwill
Indefinite-lived Intangible Assets [Member]    
Intangible Assets [Line Items]    
Indefinite Lived Intangible Assets, Gross 1,086sune_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
119sune_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
Indefinite-Lived Intangible Assets, Allocation to Renewable Energy Systems (93)sune_AllocationToRenewableEnergySystems
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
(93)sune_AllocationToRenewableEnergySystems
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
Indefinite-Lived Intangible Assets, Net 993us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
26us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
Power Plant Development Arrangements [Member]    
Intangible Assets [Line Items]    
Indefinite Lived Intangible Assets, Gross 1,083sune_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPlantDevelopmentArrangementsMember
116sune_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPlantDevelopmentArrangementsMember
Indefinite-Lived Intangible Assets, Allocation to Renewable Energy Systems (93)sune_AllocationToRenewableEnergySystems
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPlantDevelopmentArrangementsMember
(93)sune_AllocationToRenewableEnergySystems
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPlantDevelopmentArrangementsMember
Indefinite-Lived Intangible Assets, Net 990us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPlantDevelopmentArrangementsMember
23us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPlantDevelopmentArrangementsMember
Other [Member]    
Intangible Assets [Line Items]    
Indefinite Lived Intangible Assets, Gross 3sune_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
3sune_IndefiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
Indefinite-Lived Intangible Assets, Allocation to Renewable Energy Systems 0sune_AllocationToRenewableEnergySystems
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
0sune_AllocationToRenewableEnergySystems
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
Indefinite-Lived Intangible Assets, Net 3us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
3us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
Finite-Lived Intangible Assets [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 660us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FiniteLivedIntangibleAssetsMember
582us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FiniteLivedIntangibleAssetsMember
Finite-Lived Intangible Assets, Accumulated Amortization (28)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FiniteLivedIntangibleAssetsMember
(22)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FiniteLivedIntangibleAssetsMember
Finite-Lived Intangible Assets, Net 632us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FiniteLivedIntangibleAssetsMember
560us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FiniteLivedIntangibleAssetsMember
Power Purchase Agreements [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 19 years  
Finite-Lived Intangible Assets, Gross 635us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPurchaseAgreementsMember
553us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPurchaseAgreementsMember
Finite-Lived Intangible Assets, Accumulated Amortization (18)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPurchaseAgreementsMember
(13)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPurchaseAgreementsMember
Finite-Lived Intangible Assets, Net 617us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPurchaseAgreementsMember
540us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sune_PowerPurchaseAgreementsMember
Other Intangible Assets [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 6 years  
Finite-Lived Intangible Assets, Gross 25us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
29us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Finite-Lived Intangible Assets, Accumulated Amortization (10)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
(9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Finite-Lived Intangible Assets, Net $ 15us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
$ 20us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember