Derivatives and Hedging (Cash Flow Hedges - Location and Amount of Pretax Recognized in Comprehensive Income) (Details) (Designated As Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Total Pretax Gains (Losses) Recorded in AOCI	$ (6)		$ (15)	$ 72
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gains (Losses) Recorded in AOCI, interest rate contracts	(6)		(15)	71
Interest Rate Contracts [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(2)		(7)	(2)
Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gains (Losses) Recorded in AOCI, interest rate contracts
Pretax Gains (Losses) Recorded in AOCI, commodity contracts				$ 1