Postemployment Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 plan	Dec. 31, 2010	Dec. 31, 2009
Defined contribution plans
Number of defined contribution plans sponsored by the entity (in plans)	3
Contribution to plan recognized during the period
Contribution expense	$ 82	$ 69	$ 67
U.S. Savings Plan and the Non-U.S. Savings Plan | Maximum
Defined contribution plans
Matching contribution as a percentage of employee's base salary	6.00%
U.S. Savings Plan
Defined contribution plans
Number of defined contribution plans sponsored by the entity (in plans)	1
Non-U.S. Savings Plan
Defined contribution plans
Number of defined contribution plans sponsored by the entity (in plans)	1
Non-U.S. Pension Plan
Defined contribution plans
Number of defined contribution plans sponsored by the entity (in plans)	1
Non-U.S. Pension Plan | Maximum
Defined contribution plans
Matching contribution as a percentage of employee's base salary	6.50%
Non-U.S. Pension Plan | Minimum
Defined contribution plans
Matching contribution as a percentage of employee's base salary	4.50%