Schedule I - Condensed Financial Information of Parent (Guarantees and Letters of Credit) (Details) $ in Millions	12 Months Ended
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

Number of agreements under which the Parent Company has contingent contractual obligations.

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- References

No definition available.

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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

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248

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