Employee Benefit Plans - Individually Significant (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Multiemployer Plans [Line Items]
Company Contributions	$ 47	$ 47	$ 43
Multiemployer Plan, Total Individually Significant Pension Plans [Member]
Multiemployer Plans [Line Items]
Company Contributions	41	40	37
Automotive Industries Pension Plan [Member]
Multiemployer Plans [Line Items]
Company Contributions	1	1	1
Distributors Association Warehousemen's Pension Trust [Member]
Multiemployer Plans [Line Items]
Company Contributions	1	1	1
Local 731 Private Scavengers and Garage Attendants Pension Trust Fund [Member]
Multiemployer Plans [Line Items]
Company Contributions	7	7	7
Suburban Teamsters of Northern Illinois Pension Plan [Member]
Multiemployer Plans [Line Items]
Company Contributions	3	3	2
Teamsters Local 301 Pension Plan [Member]
Multiemployer Plans [Line Items]
Company Contributions	1	2	1
Western Conference of Teamsters Pension Plan [Member]
Multiemployer Plans [Line Items]
Company Contributions	27	25	24
Western Pennsylvania Teamsters and Employers Pension Plan [Member]
Multiemployer Plans [Line Items]
Company Contributions	1	1	1
Multiemployer Plan, Aggregate Individually Insignificant Pension Plans [Member]
Multiemployer Plans [Line Items]
Company Contributions	$ 6	$ 7	$ 6