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Schedule I - Condensed Financial Information of Parent (Guarantees and Letters of Credit) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) agreement
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | agreement | 67
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 1,158
Guarantees [Member] |
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | 33
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 685
Guarantees [Member] | Parent Company |
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | 34
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 712
Standby Letters of Credit [Member] | Minimum |
Condensed Financial Statements, Captions [Line Items] |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 1.00%
Standby Letters of Credit [Member] | Maximum |
Condensed Financial Statements, Captions [Line Items] |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 3.00%
Guarantee Obligations [Member] | Minimum |
Condensed Financial Statements, Captions [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 0
Guarantee Obligations [Member] | Maximum |
Condensed Financial Statements, Captions [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 157
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | 10
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 368
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] | Minimum |
Condensed Financial Statements, Captions [Line Items] |
Loss Contingency, Estimate of Possible Loss | 1
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] | Maximum |
Condensed Financial Statements, Captions [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 247
Secured Debt [Member] | Financial Standby Letter of Credit [Member] |
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | 23
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 78
Secured Debt [Member] | Financial Standby Letter of Credit [Member] | Minimum |
Condensed Financial Statements, Captions [Line Items] |
Loss Contingency, Estimate of Possible Loss | 0
Secured Debt [Member] | Financial Standby Letter of Credit [Member] | Maximum |
Condensed Financial Statements, Captions [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 49

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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=115931803&loc=d3e12069-110248 + Details
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