Commitments and Contingent Liabilities Guarantee Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Guarantee Obligations		$ 239	$ 259
Customer Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee Obligations	[1]	$ 73
Guarantor Obligations, Liquidation Proceeds, Percentage		7.00%

[1] Existing guarantees for select customers, as part of contractual agreements. The terms of the guarantees are equivalent to the terms of the customer loans that are primarily made to finance customer invoices. Of the total maximum future payments, $72 million had terms less than a year.