(Identifiable Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 782	$ 847
Accumulated Amortization	414	454
Net Intangible Assets	368	393
Customer relationships and lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	560	542
Accumulated Amortization	275	247
Net Intangible Assets	285	295
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	67
Accumulated Amortization	0	67
Net Intangible Assets	0	0
Tradenames, patents and trademarks, and developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	170	174
Accumulated Amortization	102	90
Net Intangible Assets	68	84
Land and water rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8	8
Accumulated Amortization	2	2
Net Intangible Assets	6	6
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26	26
Accumulated Amortization	25	25
Net Intangible Assets	1	1
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	18	30
Accumulated Amortization	10	23
Net Intangible Assets	$ 8	$ 7