Number of agreements under which the Parent Company has contingent contractual obligations.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of loss contingency liability.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Contingencies (Loss Contingencies) (Details) $ in Millions	12 Months Ended
Contingencies (Loss Contingencies) (Details) $ in Millions	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