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Contingencies and Commitments (Details)
$ in Millions
9 Months Ended
Sep. 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]    
Accrual for Environmental Loss Contingencies $ 4 $ 4
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,403  
Number of Agreements | agreement 103  
Guarantee Obligations [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,273  
Number of Agreements 63  
Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency Accrual $ 14 $ 55
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%  
Minimum [Member] | Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 241  
Maximum [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss 11  
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%  
Maximum [Member] | Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 481  
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 114  
Number of Agreements 25  
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 56  
Secured Debt [Member] | Financial Standby Letter of Credit [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 16  
Number of Agreements 15  
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