Employee Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Expected future benefit payments in years one through five for post-retirement medical plan	$ 7,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 8,000,000
Maximum age for retire employees to be covered under post-retirement medical plan	65
Defined Benefit Plan, Benefit Obligation	$ 20,000,000
Defined Benefit Plan, Net Periodic Benefit Cost	3,000,000	$ 3,000,000	$ 2,000,000
Other Labor-related Expenses	35,000,000	41,000,000	45,000,000
Employer matching contribution for each $1 of employee deferral	$ 1.00
Employee contribution to be matched by the Company	8.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 6,000,000	$ 7,000,000	$ 10,000,000