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Contingencies (Loss Contingencies) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
agreement
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]    
Amount (in millions) $ 930  
Obligations made by the Parent Company associated with non-recourse debt $ 0  
Number of Agreements | agreement 47  
Guarantees [Member]    
Loss Contingencies [Line Items]    
Amount (in millions) $ 815  
Number of Agreements | agreement 21  
Indemnification Agreement [Member]    
Loss Contingencies [Line Items]    
Amount (in millions) [1] $ 27  
Number of Agreements | agreement [1] 1  
Environmental    
Environmental Contingencies    
Liability recorded for projected environmental remediation costs $ 5 $ 9
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 18  
Litigation    
Litigation Contingencies    
Aggregate reserves for claims deemed both probable and reasonably estimable $ 50 $ 59
Parent Company    
Loss Contingencies [Line Items]    
Letter Of Credit Fee Range Maximum 2.25%  
Letter Of Credit Fee Range Minimum 0.25%  
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]    
Loss Contingencies [Line Items]    
Amount (in millions) $ 52  
Number of Agreements | agreement 4  
Secured Debt [Member] | Standby Letters of Credit [Member]    
Loss Contingencies [Line Items]    
Amount (in millions) $ 36  
Number of Agreements | agreement 21  
Minimum [Member] | Indemnification Agreement [Member]    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss  
Minimum [Member] | Guarantee Obligations [Member]    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 1  
Minimum [Member] | Litigation    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 140  
Minimum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 2  
Minimum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member]    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 1  
Maximum [Member] | Indemnification Agreement [Member]    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 27  
Maximum [Member] | Guarantee Obligations [Member]    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 272  
Maximum [Member] | Litigation    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 173  
Maximum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss 26  
Maximum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member]    
Litigation Contingencies    
Loss Contingency, Estimate of Possible Loss $ 13  
[1] Excludes normal and customary representations and warranties in agreements for the sale of assets (including ownership in associated legal entities) where the associated risk is considered to be nominal.