Debt (Non-Recourse Debt Maturity Schedule) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Debt Details [Line Items]
Non Recourse Debt Total	[1]	$ 15,792	$ 15,600
2015
Debt Details [Line Items]
Non Recourse Debt Total		2,529
2016
Debt Details [Line Items]
Non Recourse Debt Total		1,022
2017
Debt Details [Line Items]
Non Recourse Debt Total		1,359
2018
Debt Details [Line Items]
Non Recourse Debt Total		950
2019
Debt Details [Line Items]
Non Recourse Debt Total		1,431
Thereafter
Debt Details [Line Items]
Non Recourse Debt Total		$ 8,501

[1] .