Commitments and Contingent Liabilities Guarantees (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 239	$ 259
Customer Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	[1]	$ 73
Guaranteed Obligations, Maximum Term, Years		3 years
Equity Affiliates Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	[2]	$ 166
Guaranteed Obligations, Maximum Term, Months		9 months
Current Portion [Member] | Customer Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 72

[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.

[2] Existing guarantees for non-consolidated affiliates' liquidity needs in normal operations.