Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2013 Asbestos Claims [Member] claims	Dec. 31, 2012 Asbestos Claims [Member] claims	Sep. 30, 2012 Asbestos Claims [Member] claims
Guarantees [Abstract]
Exposure under guarantee			$ 284
Estimated fair value of guarantees			40
Commitments and Contingencies [Line Items]
Outstanding letters of credit and surety bonds			371
Number of pending asbestos claims				45,480	45,900	46,060
Number of new asbestos claims				1,180
Number of asbestos claims closed or moved to inactive docket				1,020
Costs for settlement and defense of asbestos claims, net of insurance recoveries and tax benefits	$ 21	$ 33