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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2013 claims	Dec. 31, 2012 claims	Dec. 31, 2011	Jun. 30, 2012 claims
Commitments and Contingencies [Line Items]
Outstanding letters of credit and surety bonds	$ 444
Asbestos Claims [Member]
Commitments and Contingencies [Line Items]
Number of pending asbestos claims	45,320	45,900		46,020
Number of new asbestos claims	910
Number of asbestos claims closed or moved to inactive docket	1,660
Costs for settlement and defense of asbestos claims, net of insurance recoveries and tax benefits		$ 21	$ 33