Other (Income) Expense - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other (Income) Expense [Line Items]
Other (income) expense	$ 17	$ 45	$ 39	$ 82
Professional fees		10		14
Loss from catastrophes		$ 8		11
Accounting Standards Update, Pension and Postretirement Benefits Cost | Restatement Adjustment
Other (Income) Expense [Line Items]
Other (income) expense				$ 9