Derivative and Other Hedging Instruments (Effect Of Interest Rate Swaps Designated As Hedges) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Net Periodic Interest Rate Costs on Swaps	$ 457	$ (89)
Amount of Gain or (Loss) Recognized in OCI (Effective Portion)		(707)	(21)
Amount of Gain or (Loss) Reclassified from OCI into Earnings (Effective Portion)		(140)	(57)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		(2)	0
Loss on cash flow hedge ineffectiveness		2
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	$ 252	$ 35

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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- Definition

The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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