Noncontrolling Interest - Textuals (Details) - Southern Power [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Redeemable Noncontrolling Interest [Line Items]
Redeemable Put Option	$ 164	$ 43	$ 39	$ 29
Net income attributable to redeemable noncontrolling interest	4	$ 2	$ 4
Turner Renewable Energy [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Put Option	50
SunPower Corp. [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Put Option	$ 114