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Contingencies and Commitments (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) agreement | Mar. 31, 2017 USD ($) | Dec. 31, 2017 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 17 years |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 910 |  |
Number of Agreements | agreement |  | 49 |  |
Loss Contingency Accrual, Period Increase (Decrease) |  | $ 0 | $ 12 |
Environmental Remediation Contingency [Domain] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Accrual for Environmental Loss Contingencies |  | 5 |  | $ 5
Guarantee Obligations [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 795 |  |
Number of Agreements | agreement |  | 24 |  |
Indemnification Agreement [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | [1] | $ 27 |  |
Number of Agreements | agreement | [1] | 1 |  |
Minimum [Member] | Guarantee Obligations [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 0 |  |
Minimum [Member] | Indemnification Agreement [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss | [1] | 27 |  |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 0 |  |
Letter of credit fee percentage paid |  | 1.33% |  |
Maximum [Member] | Environmental Remediation Contingency [Domain] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 19 |  |
Maximum [Member] | Guarantee Obligations [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 272 |  |
Maximum [Member] | Indemnification Agreement [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss | [1] | 27 |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 0 |  |
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 |  | $ 52 |  |
Number of Agreements | agreement |  | 4 |  |
Unsecured Debt [Member] | Minimum [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 2 |  |
Unsecured Debt [Member] | Maximum [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 26 |  |
Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |  |
Contingent Contractual Obligations [Line Items] |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 36 |  |
Number of Agreements | agreement |  | 20 |  |
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 |  | $ 13 |  |
[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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