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Contingencies and Commitments (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
agreement
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Guarantees Letters Of Credit [Abstract]      
The range of expiration dates of guarantees made by the Parent Company less than one year to more than 16 years    
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,102    
Number of Agreements | agreement 47    
Loss Contingency Accrual, Period Increase (Decrease) $ 0 $ 23  
Environmental Remediation Contingency [Domain]      
Contingent Contractual Obligations [Line Items]      
Accrual for Environmental Loss Contingencies 5   $ 5
Guarantee Obligations [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 716    
Number of Agreements | agreement 21    
Indemnification Agreement [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted [1] $ 27    
Number of Agreements | agreement [1] 1    
Minimum [Member] | Guarantee Obligations [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 0    
Minimum [Member] | Indemnification Agreement [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss [1] 27    
Minimum [Member] | Standby Letters of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 0    
Letter of credit fee percentage paid 1.07%    
Maximum [Member] | Environmental Remediation Contingency [Domain]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 16    
Maximum [Member] | Guarantee Obligations [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss 272    
Maximum [Member] | Indemnification Agreement [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss [1] 27    
Maximum [Member] | Standby Letters of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 0    
Letter of credit fee percentage paid 3.00%    
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 273    
Number of Agreements | agreement 4    
Unsecured Debt [Member] | Minimum [Member] | Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 2    
Unsecured Debt [Member] | Maximum [Member] | Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss 247    
Secured Debt [Member] | Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 86    
Number of Agreements | agreement 21    
Secured Debt [Member] | Minimum [Member] | Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 0    
Secured Debt [Member] | Maximum [Member] | Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 64    
[1] (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.