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v3.19.2

Contingencies and Commitments (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 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 15 years |
Contingent Contractual Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 1,109 |
Number of Agreements | agreement | 79 |
Litigation [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency Accrual | $ 56 | $ 53
Environmental Remediation Contingency [Domain] |  |
Contingent Contractual Obligations [Line Items] |  |
Accrual for Environmental Loss Contingencies | 4 | $ 5
Guarantee Obligations [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 656 |
Number of Agreements | 37 |
Indemnification Agreement [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 12 |
Number of Agreements | 1 |
Minimum [Member] | Litigation [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 52 |
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 | $ 12 |
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 | $ 461 |
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 | $ 12 |
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 | $ 325 |
Number of Agreements | 10 |
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 | $ 116 |
Number of Agreements | 31 |
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 | $ 49 |

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