Derivatives And Hedging Activities (Impact Of Derivative Instruments In Consolidated Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative assets	$ 9		$ 6
Derivative liabilities	23		68
Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	7		0
Derivative liabilities	21		63
Undesignated [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2		6
Derivative liabilities	2		5
Undesignated [Member] | Embedded Derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1	[1]	5	[2]
Derivative liabilities	0		0
Undesignated [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1	[1]	1	[1]
Derivative liabilities	0		0
Undesignated [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0		0
Derivative liabilities	1	[3]	5	[4]
Undesignated [Member] | Energy Related Derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0		0
Derivative liabilities	1	[3]	0
Cash Flow Hedging [Member] | Designated As Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	7	[5]	0
Derivative liabilities	21	[6]	53	[7]
Natural Gas Contracts [Member] | Cash Flow Hedging [Member] | Designated As Hedging Instrument [Member] | Commodities [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0		0
Derivative liabilities	$ 0		$ 10	[3]

[1] Included in Other current assets in the accompanying consolidated balance sheet.

[2] Included in Deferred charges and other assets in the accompanying consolidated balance sheet.

[3] Included in Other accrued liabilities in the accompanying consolidated balance sheet.

[4] Included in Other liabilities in the accompanying consolidated balance sheet.

[5] Includes $3 million recorded in Other current assets and $4 million recorded in Deferred charges and other assets in the accompanying consolidated balance sheet.

[6] Includes $20 million recorded in Other accrued liabilities and $1 million recorded in Other liabilities in the accompanying consolidated balance sheet.

[7] Includes $32 million recorded in Other accrued liabilities and $21 million recorded in Other liabilities in the accompanying consolidated balance sheet.