Presentation Presentation (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 513	$ 589	$ 597
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property Subject to or Available for Operating Lease, Accumulated Depreciation		78
Financing Receivable, Allowance for Credit Loss		$ (78)