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Contingencies and Commitments (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
agreement
Dec. 31, 2018
USD ($)
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 $ 1,108  
Number of Agreements | agreement 65  
Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency Accrual $ 55 $ 53
Environmental Remediation Contingency [Domain]    
Contingent Contractual Obligations [Line Items]    
Accrual for Environmental Loss Contingencies 5  
Guarantee Obligations [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 633  
Number of Agreements 28  
Indemnification Agreement [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 27  
Number of Agreements 1  
Minimum [Member] | Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 79  
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 $ 27  
Minimum [Member] | Standby Letters of Credit [Member]    
Contingent Contractual Obligations [Line Items]    
Letter of credit fee percentage paid 1.00%  
Maximum [Member] | Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 439  
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 157  
Maximum [Member] | Indemnification Agreement [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 27  
Maximum [Member] | Standby Letters of Credit [Member]    
Contingent Contractual Obligations [Line Items]    
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 $ 368  
Number of Agreements 6  
Unsecured Debt [Member] | Minimum [Member] | Financial Standby Letter of Credit [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 1  
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 $ 80  
Number of Agreements 30  
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 $ 32