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Contingencies (Loss Contingencies) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) agreement | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 1,158 |
Number of Agreements | agreement | 67 |
Guarantees [Member] |  |
Loss Contingencies [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 685 |
Number of Agreements | 33 |
Environmental Remediation Contingency [Domain] |  |
Environmental Contingencies |  |
Liability recorded for projected environmental remediation costs | $ 5 |
Indemnification Agreement [Member] |  |
Loss Contingencies [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 27 |
Number of Agreements | 1 |
Litigation |  |
Litigation Contingencies |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | $ 53 | $ 50
Parent Company [Member] | Guarantees [Member] |  |
Loss Contingencies [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 712 |
Number of Agreements | 34 |
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 368 |
Number of Agreements | 10 |
Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 78 |
Number of Agreements | 23 |
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 | 79 |
Minimum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |
Environmental Contingencies |  |
Loss Contingency, Estimate of Possible Loss | 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 | $ 17 |
Maximum [Member] | Indemnification Agreement [Member] |  |
Environmental Contingencies |  |
Loss Contingency, Estimate of Possible Loss | 27 |
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 | 439 |
Maximum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |
Environmental Contingencies |  |
Loss Contingency, Estimate of Possible Loss | 247 |
Maximum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |
Environmental Contingencies |  |
Loss Contingency, Estimate of Possible Loss | $ 49 |

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