Segment and Geographic Area Information - Schedule of Reconciliation of Certain Segment Information to Consolidated Totals (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales (B and C)	$ 3,472	$ 3,524	$ 3,573	$ 3,445	$ 3,271	$ 3,236	$ 3,261	$ 3,192	$ 14,014	$ 12,960	$ 12,394
Total segment sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales (B and C)									14,206	13,102	12,513
Elimination of intersegment sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales (B and C)									160	148	118
Corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales (B and C)									$ (32)	$ 6	$ (1)