Pension and Other Postretirement Benefit Plans (Change in benefit obligation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. pension plan assets [Member]
Change in Benefit Obligation
Balance as of beginning-of-year	$ 1,238	$ 1,093
Service cost	5	3	(3)
Interest cost	53	58	(61)
Plan participants' contributions	0	0
Curtailments	0	0
Actuarial (gains) losses	56	154
Benefits paid	68	70
Medicare Part D subsidy	0	0
Foreign exchange translation	0	0
Balance as of end-of-year	1,284	1,238	1,093
Funded status of the plans	(241)	(282)
Non-U.S. Pension Benefits [Member]
Change in Benefit Obligation
Balance as of beginning-of-year	311	271
Service cost	0	0
Interest cost	15	15	(16)
Plan participants' contributions	0	0
Curtailments	0	0
Actuarial (gains) losses	52	38
Benefits paid	14	12
Medicare Part D subsidy	0	0
Foreign exchange translation	0	(1)
Balance as of end-of-year	364	311	271
Funded status of the plans	7	39
Other Postretirement Benefits [Member]
Change in Benefit Obligation
Balance as of beginning-of-year	161	155
Service cost	4	4	(3)
Interest cost	7	7	(9)
Plan participants' contributions	6	6
Curtailments	0	0
Actuarial (gains) losses	(24)	5
Benefits paid	17	17
Medicare Part D subsidy	(2)	(1)
Foreign exchange translation	0	0
Balance as of end-of-year	139	161	155
Funded status of the plans	$ (97)	$ (122)