Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Proposed Separation Transaction - Narrative (Details) $ in Millions		3 Months Ended
	Feb. 08, 2019 company	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of independent, publicly-traded companies resulting from proposed separation transaction \| company	2
Restructuring and other charges (D)		$ 12	$ 7
Business separation \| Proposed Separation Transaction \| Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges (D)		$ 3