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Contingencies and Commitments (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
agreement
Jun. 30, 2016
USD ($)
Dec. 31, 2016
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 17 years    
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,081    
Number of Agreements | agreement 45    
Loss Contingency Accrual, Period Increase (Decrease) $ 23 $ 21  
Environmental Remediation Contingency [Domain]      
Contingent Contractual Obligations [Line Items]      
Accrual for Environmental Loss Contingencies 9   $ 12
Guarantee Obligations [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 799    
Number of Agreements | agreement 19    
Indemnification Agreement [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted [1] $ 27    
Number of Agreements | agreement [1] 1    
Standby Letters of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 3    
Number of Agreements | agreement 1    
Minimum [Member] | Guarantee Obligations [Member]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 8    
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 $ 3    
Letter of credit fee percentage paid 0.25%    
Maximum [Member] | Environmental Remediation Contingency [Domain]      
Contingent Contractual Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 22    
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 $ 3    
Letter of credit fee percentage paid 2.25%    
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 245    
Number of Agreements | agreement 8    
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 73    
Secured Debt [Member] | Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 7    
Number of Agreements | agreement 16    
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 $ 1    
[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.