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Debt (Non-Recourse Debt Maturity Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Details [Line Items]    
Non-Recourse Debt $ (321)  
Non Recourse Debt Total 16,354 $ 16,712
Construction line of credit facility remaining borrowing capacity 215  
Other line of credit remaining borrowing capacity 868  
Nonrecourse Debt    
Debt Details [Line Items]    
Long-Term Debt, Maturity, Year Two 516  
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three 1,017  
Long-Term Debt, Maturity, Year Four 1,307  
Long-Term Debt, Maturity, Year Five 996  
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five 11,400  
Nonrecourse Debt    
Debt Details [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months $ 1,439