Pension and Post-Retirement Benefits - Reconciliation of Funded Status of the Plans and the Amounts Included in the Company's Consolidated Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
United States
Change in benefit obligations
Beginning obligations	$ 170	$ 155
Service cost	10	8	7
Interest cost	7	7	8
Participant contributions	0	0
Plan curtailments	(16)	0
Benefits and expenses paid	(6)	(6)
Actuarial loss (gain)	13	6
Changes in foreign currency exchange rates	0	0
Ending obligations	178	170	155
Changes in plans assets
Beginning fair value	138	134
Actual return on plan assets	19	2
Employer contributions	7	8
Participant contributions	0	0
Plan settlements	0	0
Benefits and expenses paid	(6)	(6)
Changes in foreign currency exchange rates	0	0
Ending fair value	158	138	134
Reconciliation of funded status
Funded status	(20)	(32)
Net Consolidated Balance Sheet liability	(20)	(32)
International
Change in benefit obligations
Beginning obligations	260	244
Service cost	8	9	7
Interest cost	9	9	9
Participant contributions	3	3
Plan curtailments	0	0
Benefits and expenses paid	(5)	(10)
Actuarial loss (gain)	16	7
Changes in foreign currency exchange rates	8	(2)
Ending obligations	299	260	244
Changes in plans assets
Beginning fair value	198	201
Actual return on plan assets	17	(2)
Employer contributions	8	7
Participant contributions	3	3
Plan settlements	0	0
Benefits and expenses paid	(5)	(10)
Changes in foreign currency exchange rates	7	(1)
Ending fair value	228	198	201
Reconciliation of funded status
Funded status	(71)	(62)
Net Consolidated Balance Sheet liability	(71)	(62)
Post-Retirement Medical Benefit Plans
Change in benefit obligations
Beginning obligations	52	49
Service cost	1	1	1
Interest cost	2	3	3
Participant contributions	1	1
Plan curtailments	0	0
Benefits and expenses paid	(1)	(4)
Actuarial loss (gain)	(8)	2
Changes in foreign currency exchange rates	0	0
Ending obligations	47	52	49
Changes in plans assets
Beginning fair value	0	0
Actual return on plan assets	0	0
Employer contributions	0	2
Participant contributions	1	1
Plan settlements	0	0
Benefits and expenses paid	(1)	(3)
Changes in foreign currency exchange rates	0	0
Ending fair value	0	0	0
Reconciliation of funded status
Funded status	(47)	(52)
Net Consolidated Balance Sheet liability	$ (47)	$ (52)