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Contingencies and Commitments (Details)
$ in Millions
3 Months Ended
Mar. 31, 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 more than 15 years  
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 1,275  
Number of Agreements | agreement 81  
Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency Accrual $ 43 $ 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 $ 906  
Number of Agreements 43  
Indemnification Agreement [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted [1] $ 12  
Number of Agreements 1  
Minimum [Member] | Litigation [Member]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 260  
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 $ 689  
Maximum [Member] | Environmental Remediation Contingency [Domain]    
Contingent Contractual Obligations [Line Items]    
Loss Contingency, Estimate of Possible Loss 13  
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 $ 12  
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 $ 343  
Number of Agreements 14  
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 296  
Secured Debt [Member] | Financial Standby Letter of Credit [Member]    
Contingent Contractual Obligations [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 14  
Number of Agreements 23  
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 $ 4  
[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.