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Debt (Non-Recourse Debt Carrying Amounts and Terms) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Construction Line Of Credit Facility Remaining Borrowing Capacity $ 470    
Gain (Loss) on Extinguishment of Debt (169) $ (188) $ (68)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (318) (368)  
Non-recourse Debt, excluding Finance Lease Liabilities 16,712    
Non-Recourse Debt   15,645  
Non-recourse Debt Current Maturities [1] (1,865)    
Non-Recourse Debt, Current Balance [1]   1,659  
Non-recourse Debt, excluding Finance Lease Liabilities, Noncurrent [1] 14,847    
Derivative, notional amount 1,800    
Other Line Of Credit Facility Remaining Borrowing Capacity $ 1,100    
Non-Recourse Debt, Noncurrent Balance [1]   13,986  
Variable Rate Debt | Bank loans      
Debt Instrument [Line Items]      
Weighted Average Interest Rate 4.25%    
Non-Recourse Debt $ 3,389 2,600  
Variable Rate Debt | Notes and bonds      
Debt Instrument [Line Items]      
Weighted Average Interest Rate 3.99%    
Non-Recourse Debt $ 1,056 821  
Variable Rate Debt | Debt to (or guaranteed by) multilateral, export credit agencies or development banks      
Debt Instrument [Line Items]      
Weighted Average Interest Rate [2] 1.73%    
Non-Recourse Debt [2] $ 460 3,292  
Fixed Rate Debt | Bank loans      
Debt Instrument [Line Items]      
Weighted Average Interest Rate 5.19%    
Non-Recourse Debt $ 2,900 1,684  
Fixed Rate Debt | Notes and bonds      
Debt Instrument [Line Items]      
Weighted Average Interest Rate 5.51%    
Non-Recourse Debt $ 8,098 7,346  
Fixed Rate Debt | Debt to (or guaranteed by) multilateral, export credit agencies or development banks      
Debt Instrument [Line Items]      
Weighted Average Interest Rate [2] 6.09%    
Non-Recourse Debt [2] $ 1,110 246  
Fixed Rate Debt | Other      
Debt Instrument [Line Items]      
Weighted Average Interest Rate 4.20%    
Non-Recourse Debt $ 17 $ 24  
[1]
Excludes $3 million (current) and $67 million (noncurrent) finance lease liabilities included in the respective non-recourse debt line items on the Consolidated Balance Sheet as of December 31, 2019. See Note 14Leases for further information.
[2]
Multilateral loans include loans funded and guaranteed by bilaterals, multilaterals, development banks and other similar institutions.