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Contingencies (Loss Contingencies) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) agreement | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |
Amount (in millions) |  | $ 930 |
Obligations made by the Parent Company associated with non-recourse debt |  | $ 0 |
Number of Agreements | agreement |  | 47 |
Guarantees [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Amount (in millions) |  | $ 815 |
Number of Agreements | agreement |  | 21 |
Indemnification Agreement [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Amount (in millions) | [1] | $ 27 |
Number of Agreements | agreement | [1] | 1 |
Environmental |  |  |
Environmental Contingencies |  |  |
Liability recorded for projected environmental remediation costs |  | $ 5 | $ 9
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 18 |
Litigation |  |  |
Litigation Contingencies |  |  |
Aggregate reserves for claims deemed both probable and reasonably estimable |  | $ 50 | $ 59
Parent Company |  |  |
Loss Contingencies [Line Items] |  |  |
Letter Of Credit Fee Range Maximum |  | 2.25% |
Letter Of Credit Fee Range Minimum |  | 0.25% |
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Amount (in millions) |  | $ 52 |
Number of Agreements | agreement |  | 4 |
Secured Debt [Member] | Standby Letters of Credit [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Amount (in millions) |  | $ 36 |
Number of Agreements | agreement |  | 21 |
Minimum [Member] | Indemnification Agreement [Member] |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |
Minimum [Member] | Guarantee Obligations [Member] |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 1 |
Minimum [Member] | Litigation |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 140 |
Minimum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 2 |
Minimum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 1 |
Maximum [Member] | Indemnification Agreement [Member] |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 27 |
Maximum [Member] | Guarantee Obligations [Member] |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 272 |
Maximum [Member] | Litigation |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 173 |
Maximum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | 26 |
Maximum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |  |
Litigation Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 13 |
[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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