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Leases Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Schedule of Lease Assets and Liabilities [Line Items]
Guarantee Obligations	$ 164	$ 299	$ 179
Minimum [Member]
Schedule of Lease Assets and Liabilities [Line Items]
Lessee Operating and Finance Leases, Remaining Lease Term	1 year
Maximum [Member]
Schedule of Lease Assets and Liabilities [Line Items]
Lessee Operating and Finance Leases, Remaining Lease Term	53 years
Residual Value Guarantee [Member]
Schedule of Lease Assets and Liabilities [Line Items]
Guarantee Obligations	$ 103

X

- Definition

Lessee, operating and financing leases remaining lease term

+ References

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+ Details

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- Definition

[Line Items] for Schedule of Lease Assets and Liabilities [Table]

+ References

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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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