Long-Term Financing Receivables(Class and Credit Risk Information) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total long-term receivables	$ 512	$ 516
Long-term trade accounts receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total long-term receivables	251	251
Notes and leases receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total long-term receivables	$ 261	$ 265