Derivatives and Hedging Activities (Gains Losses Recognized In Accumulated Other Comprehensive Income AOCI Net Of Tax Related To Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI on derivatives (effective portion)	$ 0	$ 15	$ (43)
Designated as Hedging Instrument [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI on derivatives (effective portion)	0	16	(39)
Designated as Hedging Instrument [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI on derivatives (effective portion)	0	0	2
Designated as Hedging Instrument [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Natural Gas Swap Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI on derivatives (effective portion)	$ 0	$ (1)	$ (6)