Accrued Expenses and Other Long-Term Liabilities (Details) (USD $) In Millions, unless otherwise specified					1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Sep. 30, 2012 Aruba Refinery [Member] employees	Mar. 31, 2013 Aruba Refinery [Member]	Dec. 31, 2012 Aruba Refinery [Member]	Dec. 31, 2012 Aruba Refinery [Member]	Dec. 31, 2013 Income Taxes Payable [Member]
Accrued Expenses
Defined benefit plan liabilities, current	$ 30		$ 32
Wage and other employee-related liabilities, current	257		282
Environmental liabilities, current	24		27
Accrued interest expense, current	90		96
Derivative liabilities, current	13		14
Asset retirement obligations, current	5		5
Other accrued liabilities, current	103		134
Accrued expenses	522		590
Other Long-Term Liabilities
Defined benefit plan liabilities, noncurrent	507		982
Wage and other employee-related liabilities, noncurrent	97		91
Uncertain income tax position liabilities, including related penalties and interest	205	[1]	391	[1]
Environmental liabilities, noncurrent	277		242
Derivative liabilities, noncurrent	0		0
Asset retirement obligations, noncurrent	26		103
Other accrued liabilities, noncurrent	217		321
Other long-term liabilities	1,329		2,130
Uncertain tax position liabilities	443		391
Uncertain tax position liabilities, current									238
One-Time Severance Benefits (Textual)
Number of employees notified of termination					495
Termination date					Nov. 15, 2012
Severance liability					41
Severance payments						10	31
Severance costs								$ 41

[1] As of December 31, 2013, our total liability for uncertain tax positions, including related penalties and interest, was $443 million, with $238 million classified as a current liability and reflected in “Income taxes payable” and the remaining $205 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table. As of December 31, 2012, our total liability for uncertain tax positions, including related penalties and interest, was classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table.