(Identifiable Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 764	$ 782
Accumulated Amortization	447	414
Net Intangible Assets	317	368
Customer relationships and lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	542	560
Accumulated Amortization	294	275
Net Intangible Assets	248	285
Tradenames, patents and trademarks, and developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	170	170
Accumulated Amortization	117	102
Net Intangible Assets	53	68
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	25	26
Accumulated Amortization	24	25
Net Intangible Assets	1	1
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19	18
Accumulated Amortization	10	10
Net Intangible Assets	$ 9	$ 8