Pensions, Other Post-employment Benefits and Employee Benefit Plans Net Periodic Benefit Cost (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Benefits
Net Periodic Benefit Cost [Line Items]
Service cost	$ 4	$ 7	$ 8	$ 14
Interest cost	17	20	35	41
Expected return on plan assets	(18)	(16)	(35)	(32)
Amortization of actuarial losses	7	9	13	19
Amortization of prior service credit	0	0	0	0
Settlement gain	0	0	0	(1)
Curtailment gain	0	0	0	0
Net periodic benefit cost	10	20	21	41
OPEB
Net Periodic Benefit Cost [Line Items]
Service cost	0	0	0	0
Interest cost	4	4	8	8
Expected return on plan assets	0	0	0	0
Amortization of actuarial losses	1	0	3	0
Amortization of prior service credit	(3)	(4)	(6)	(8)
Settlement gain	0	0	0	0
Curtailment gain	(19)	0	(19)	0
Net periodic benefit cost	(17)	0	(14)	0
Automotive Segment [Member] | United States Welfare Benefit Plan [Member]
Net Periodic Benefit Cost [Line Items]
Curtailment gain	$ (19)		$ (19)