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Contingencies and Commitments (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($) agreement
Schedule Of Contingent Contractual Obligations [Line Items] |
The range of expiration dates of guarantees made by the Parent Company | less than one year to no more than 15 years
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 2,164
Number of Agreements | agreement | 120
Obligations Number Of Agreements | agreement | 120
Guarantee Obligations [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 2,001
Number of Agreements | 73
Obligations Number Of Agreements | 73
Financial Standby Letter of Credit [Member] | Unsecured Debt [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 103
Number of Agreements | 24
Obligations Number Of Agreements | 24
Financial Standby Letter of Credit [Member] | Secured Debt [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 59
Number of Agreements | 22
Obligations Number Of Agreements | 22
Surety Bond |
Schedule Of Contingent Contractual Obligations [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 1
Number of Agreements | 1
Obligations Number Of Agreements | 1
Minimum [Member] | Guarantee Obligations [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 0
Minimum [Member] | Financial Standby Letter of Credit [Member] | Unsecured Debt [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Loss Contingency, Estimate of Possible Loss | 0
Minimum [Member] | Financial Standby Letter of Credit [Member] | Secured Debt [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 0
Minimum [Member] | Standby Letters of Credit [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 1.00%
Letter of credit fee percentage paid | 1.00%
Maximum [Member] | Guarantee Obligations [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 400
Maximum [Member] | Financial Standby Letter of Credit [Member] | Unsecured Debt [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Loss Contingency, Estimate of Possible Loss | 51
Maximum [Member] | Financial Standby Letter of Credit [Member] | Secured Debt [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Loss Contingency, Estimate of Possible Loss | 24
Maximum [Member] | Surety Bond |
Schedule Of Contingent Contractual Obligations [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 1
Maximum [Member] | Standby Letters of Credit [Member] |
Schedule Of Contingent Contractual Obligations [Line Items] |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 3.00%
Letter of credit fee percentage paid | 3.00%

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
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