Commitments and Contingent Liabilities (Accretion Of Future Funding Obligation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Total obligation	$ 920
Asbestos litigation reserve current	680	683
Asbestos litigation reserve noncurrent	240	237
Total	105
Asbestos Issue [Member]
Commitments and Contingencies Disclosure [Line Items]
Asbestos litigation reserve noncurrent	5
Remainder of 2012	10
2013	14
2014-2023	81
Total	$ 105