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Revenues (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]          
Retained Earnings $ 313   $ 313   $ 156
Notes receivable, net of allowances 45   45   $ 42
Revenue recognized 12 $ 12 $ 59 $ 61  
Contract with customer asset term     1 year    
Impact of adopting ASC 606 [Member] | Scenario, Adjustment [Member]          
Disaggregation of Revenue [Line Items]          
Retained Earnings $ 3   $ 3