Pension And Other Postretirement Benefits (Change In The Fair Value Of Level 3 Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits - U.S. [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	$ 458	$ 408
Net realized gains/(losses)	2	1
Net unrealized gains/(losses)	41	56
Net purchases/(sales)	(12)	(7)
Fair value at December 31	489	458
Pension Benefits - U.S. [Member] | Private Mortgages [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1		128
Net realized gains/(losses)		5
Net purchases/(sales)		(133)
Pension Benefits - Non-U.S. [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	393	315
Net realized gains/(losses)	2	7
Net unrealized gains/(losses)	22	33
Net purchases/(sales)	31	38
Fair value at December 31	448	393
Pension Benefits - Non-U.S. [Member] | Private Mortgages [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	4	4
Net realized gains/(losses)		0
Net unrealized gains/(losses)	1
Fair value at December 31	5	4
Pension Benefits - Non-U.S. [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	397	417
Net realized gains/(losses)	(14)	3
Net unrealized gains/(losses)	(1)	6
Net purchases/(sales)	(89)	(29)
Fair value at December 31	293	397
Other Postretirement Benefits [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	7	5
Net realized gains/(losses)	0
Net unrealized gains/(losses)		2
Fair value at December 31	7	7
Other Postretirement Benefits [Member] | Private Mortgages [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1		2
Net purchases/(sales)		$ (2)