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v3.19.1

Contingencies and Commitments (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) agreement | Dec. 31, 2018 USD ($)
Guarantees Letters Of Credit [Abstract] |  |
The range of expiration dates of guarantees made by the Parent Company | less than one year to more than 16 years |
Contingent Contractual Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 1,108 |
Number of Agreements | agreement | 65 |
Litigation [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency Accrual | $ 55 | $ 53
Environmental Remediation Contingency [Domain] |  |
Contingent Contractual Obligations [Line Items] |  |
Accrual for Environmental Loss Contingencies | 5 |
Guarantee Obligations [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 633 |
Number of Agreements | 28 |
Indemnification Agreement [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 27 |
Number of Agreements | 1 |
Minimum [Member] | Litigation [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 79 |
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 | $ 27 |
Minimum [Member] | Standby Letters of Credit [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Letter of credit fee percentage paid | 1.00% |
Maximum [Member] | Litigation [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 439 |
Maximum [Member] | Environmental Remediation Contingency [Domain] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 16 |
Maximum [Member] | Guarantee Obligations [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 157 |
Maximum [Member] | Indemnification Agreement [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 27 |
Maximum [Member] | Standby Letters of Credit [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
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 | $ 368 |
Number of Agreements | 6 |
Unsecured Debt [Member] | Minimum [Member] | Financial Standby Letter of Credit [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 1 |
Unsecured Debt [Member] | Maximum [Member] | Financial Standby Letter of Credit [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 247 |
Secured Debt [Member] | Financial Standby Letter of Credit [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 80 |
Number of Agreements | 30 |
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 | $ 32 |

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