Accrued Expenses and Other Long-Term Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Accrued Expenses
Defined benefit plan liabilities, current	$ 32	$ 40
Wage and other employee-related liabilities, current	225	292
Environmental liabilities, current	29	27
Environmental credit obligations, current	214	8
Accrued interest expense, current	104	96
Other accrued liabilities, current	90	91
Accrued expenses	694	554
Other Long-Term Liabilities
Defined benefit plan liabilities, noncurrent	742	719
Wage and other employee-related liabilities, noncurrent	103	100
Uncertain tax position liabilities, noncurrent	465	148
Environmental liabilities, noncurrent	223	231
Other accrued liabilities, noncurrent	211	413
Other long-term liabilities	$ 1,744	$ 1,611