Commitments and Contingencies (Product Warranty and Recall Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2010 Product Recall [Member]	Dec. 31, 2011 Product Recall [Member]	Dec. 31, 2011 Positive Outcome of Litigation [Member]	Dec. 31, 2009 Positive Outcome of Litigation [Member]
Product Liability Contingency [Line Items]
Product Recall Total Expected Costs	$ 75	$ 66
Product Liability Contingency, Accrual, Assumptions	1.8
Product Liability Accrual, Period Expense				70
Product Liability Accrual, Period Expense, Caption				cost of products sold
Loss Contingency Accrual , Product Liability, Gross			0
Former Gain Contingency, Recognized in Current Period			$ 61
Gain Contingency, Income Statement Caption			cost of products sold