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Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Identification of variable interest entities through investments and transactions
Revenue	$ 464	$ 526	$ 578	$ 562	$ 484	$ 533	$ 626	$ 622	$ 2,130	$ 2,265	$ 2,209
Income from continuing operations before income taxes									(20)	(165)	186
Net cash provided by operating activities									33	282	338
Consolidated VIE's
Identification of variable interest entities through investments and transactions
Revenue									93	117	127
Income from continuing operations before income taxes									10	13	21
Net cash provided by operating activities									$ 12	$ 16	$ 25
Pacific Iron Products
Identification of variable interest entities through investments and transactions
Variable interest entity ownership percentage									50.00%
Viance
Identification of variable interest entities through investments and transactions
Variable interest entity ownership percentage									50.00%