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Contingencies (Loss Contingencies) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) agreement | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Term |  | less than one year to more than 15 years |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 1,226 |  |
Number of Agreements | agreement |  | 77 |  |
Environmental Remediation Contingency [Domain] |  |  |  |
Environmental Contingencies |  |  |  |
Liability recorded for projected environmental remediation costs |  | $ 4 |  | $ 5
Indemnification Agreement [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | [1] | $ 12 |  |
Number of Agreements | [1] | 1 |  |
Guarantee Obligations [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 853 |  |
Number of Agreements |  | 37 |  |
Litigation |  |  |  |
Litigation Contingencies |  |  |  |
Aggregate reserves for claims deemed both probable and reasonably estimable |  | $ 55 |  | $ 53
Parent Company [Member] | Guarantees [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 865 |  |
Number of Agreements |  | 38 |  |
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 342 |  |
Number of Agreements |  | 11 |  |
Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 19 |  |
Number of Agreements |  | 28 |  |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 1.00% |  |
Minimum [Member] | Guarantee Obligations [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 0 |  |
Minimum [Member] | Litigation |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 75 |  |
Minimum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 1 | $ 1 |
Minimum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 0 |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 3.00% |  |
Maximum [Member] | Environmental Remediation Contingency [Domain] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 15 |  |
Maximum [Member] | Indemnification Agreement [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss | [1] | 12 |  |
Maximum [Member] | Guarantee Obligations [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 157 |  |
Maximum [Member] | Litigation |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 503 |  |
Maximum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 296 | 296 |
Maximum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Environmental Contingencies |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 4 | $ 4 |
[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.

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