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.

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=121555522&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Leases Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Leases Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Operating Leases, Rent Expense, Net		$ 225
Guarantee Obligations	$ 94		$ 97
Residual Value Guarantee [Member]
Guarantee Obligations	$ 248
Minimum [Member]
Remaining Lease Term	1 year
Maximum [Member]
Remaining Lease Term	51 years