Business Acquisitions and Dispositions Business Acquisitions and Dispositions (2016 and 2015 Acquisitions) $ in Millions			3 Months Ended
	Oct. 03, 2016 USD ($) MW	Aug. 13, 2014 USD ($)	Dec. 31, 2016 USD ($) MW	Jun. 30, 2015 USD ($) MW	Dec. 31, 2014 USD ($)	Aug. 12, 2014 USD ($) MW
SunEdison Utility-Scale Solar and Wind [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			$ 124
Business Acquisitions, Consideration Transferred, Purchase Price			328
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other			5
Business Combination, Contingent Consideration, Liability			59
SunEdison Solar Distributed Generation [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	29
Payments to Acquire Businesses, Gross	$ 67
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			47
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 15
Desert Sunlight [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW				550
Payments to Acquire Businesses, Gross				$ 285
Percentage of Ownership				25.00%
Alta Wind Portfolio [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW						947
Payments to Acquire Businesses, Gross		$ 923
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					$ 1,591
Business Acquisitions, Consideration Transferred, Purchase Price						$ 870
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					1,304
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					1,177
Percentage of Ownership						100.00%
EME [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					1,249
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other					724
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					2,438
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					$ 172
Construction-ready solar facility [Member] | SunEdison Utility-Scale Solar and Wind [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW			154
Payments to Acquire Businesses, Gross			$ 11
Construction-ready and in-development solar assets [Member] | SunEdison Utility-Scale Solar and Wind [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW			110
Payments to Acquire Businesses, Gross			$ 2
In-development solar assets [Member] | SunEdison Utility-Scale Solar and Wind [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW			71
Mechanically-complete solar assets [Member] | SunEdison Utility-Scale Solar and Wind [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW			530
In-development wind assets [Member] | SunEdison Utility-Scale Solar and Wind [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			$ 111
Remaining Lease Term			20 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 222
NRG [Member] | Mechanically-complete solar assets [Member] | SunEdison Utility-Scale Solar and Wind [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW			265
Post-closing obligations [Member] | SunEdison Solar Distributed Generation [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 5
Non Recourse Debt [Member] | Utah Portfolio [Member]
Business Acquisition [Line Items]
Additional Debt Borrowed			$ 65