Derivatives And Hedging Activities (Gains Or Losses Recognized In Accumulated Other Comprehensive Income (AOCI), Net Of Tax, Related To Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 27	$ 4
Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	28	3
Fuel Oil Contracts [Member] | Cash Flow Hedging [Member] | Commodities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	0	2
Natural Gas Contracts [Member] | Cash Flow Hedging [Member] | Commodities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (1)	$ (1)