Company Restructuring (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Restructuring Reserve
Balance at the beginning of the period	$ 10
Expense incurred	15
Payments applied against liability	(16)
Balance at the end of the period	9
Employee costs
Restructuring Reserve
Balance at the beginning of the period	5
Expense incurred	10
Payments applied against liability	(9)
Balance at the end of the period	6
Cumulative amount incurred to date for active programs	85
Exit costs
Restructuring Reserve
Balance at the beginning of the period	5
Expense incurred	5
Payments applied against liability	(7)
Balance at the end of the period	3
Cumulative amount incurred to date for active programs	$ 50