Financial Derivatives (Total Gross Derivatives) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative Asset, Fair Value	$ 4,804	$ 4,793
Derivative Liability, Fair Value	3,834	3,934
Derivative Notional Amount	436,413	381,256
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	1,228	1,189
Derivative Liability, Fair Value	264	364
Derivative Notional Amount	39,529	36,197
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	3,576	3,604
Derivative Liability, Fair Value	3,570	3,570
Derivative Notional Amount	$ 396,884	$ 345,059