Company Restructuring (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Restructuring Reserve
Balance at the beginning of the period	$ 9
Expense incurred	22
Payments applied against liability	(3)
Balance at the end of the period	28
Employee costs
Restructuring Reserve
Balance at the beginning of the period	6
Expense incurred	22
Payments applied against liability	(2)
Balance at the end of the period	26
Cumulative amount incurred to date for active programs	93
Exit costs
Restructuring Reserve
Balance at the beginning of the period	3
Payments applied against liability	(1)
Balance at the end of the period	2
Cumulative amount incurred to date for active programs	$ 49