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Contingencies and Commitments (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
agreement
Dec. 31, 2019
USD ($)
Guarantees Letters Of Credit [Abstract]    
The range of expiration dates of guarantees made by the Parent Company less than one year to no more than 15 years  
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,508  
Number of Agreements | agreement 98  
Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency Accrual $ 31 $ 55
Environmental Remediation Contingency [Domain]    
Contingent Contractual Obligations [Line Items]    
Accrual for Environmental Loss Contingencies 4  
Guarantee Obligations [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,243  
Number of Agreements 63  
Minimum [Member] | Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 265  
Minimum [Member] | Guarantee Obligations [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 0  
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 $ 313  
Maximum [Member] | Environmental Remediation Contingency [Domain]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss 12  
Maximum [Member] | Guarantee Obligations [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 157  
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 $ 238  
Number of Agreements 5  
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 211  
Secured Debt [Member] | Financial Standby Letter of Credit [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 27  
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 $ 6