Financial Derivatives (Derivatives Designated As Hedging Instruments Under GAAP) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative Asset, Fair Value	$ 4,351,000,000	$ 4,793,000,000
Derivative Liability, Fair Value	3,547,000,000	3,934,000,000
Derivative Notional Amount	342,838,000,000	381,256,000,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	1,026,000,000	1,189,000,000
Derivative Liability, Fair Value	233,000,000	364,000,000
Derivative Notional Amount	43,305,000,000	36,197,000,000
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	3,325,000,000	3,604,000,000
Derivative Liability, Fair Value	3,314,000,000	3,570,000,000
Derivative Notional Amount	299,533,000,000	345,059,000,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	735,000,000	925,000,000
Derivative Liability, Fair Value	204,000,000	296,000,000
Derivative Notional Amount	24,239,000,000	20,522,000,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Receive Fixed Swaps [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	723,000,000	871,000,000
Derivative Liability, Fair Value	108,000,000	230,000,000
Derivative Notional Amount	19,782,000,000	16,446,000,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Pay Fixed Swaps [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	12,000,000	54,000,000
Derivative Liability, Fair Value	96,000,000	66,000,000
Derivative Notional Amount	4,457,000,000	4,076,000,000
Cash Flow Hedging [Member] | Forward Purchase Commitments [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	2,000,000
Derivative Notional Amount	550,000,000
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	284,000,000	264,000,000
Derivative Liability, Fair Value	29,000,000	58,000,000
Derivative Notional Amount	18,121,000,000	14,737,000,000
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | One Month Libor [Member]
Derivative [Line Items]
Derivative Variable Interest Rate	44.00%	43.00%
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Three Month Libor [Member]
Derivative [Line Items]
Derivative Variable Interest Rate	56.00%	57.00%
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Receive Fixed Swaps [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	282,000,000	264,000,000
Derivative Liability, Fair Value	29,000,000	58,000,000
Derivative Notional Amount	17,571,000,000	14,737,000,000
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	7,000,000
Derivative Liability, Fair Value		10,000,000
Derivative Notional Amount	$ 945,000,000	$ 938,000,000