Revenues Contract Receivables and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Receivables from contracts with customers, included in receivables, less reserves	$ 837	$ 714
Contract with Customer, Asset, Net, Current	0
Contract asset (liability)	0	$ (1)
Revenue recognized as performance obligations are satisfied	74
Contract with Customer, Asset, Reclassified to Receivable	52
Contract With Customer, Liability, Increase (Decrease) For Contract Sold In Disposition	$ 21