Derivative Financial Instruments (Schedule Of Outstanding Hedges: (Notional Amount)) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Notional Amount of Derivatives	$ 4,666	$ 1,886
Swap Agreements And Forwards [Member] | Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	250,003	52,383
Swap Agreements And Forwards [Member] | Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	2,161	1,886
Options And Caps Purchased [Member] | Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	1,069	140
Options And Caps Written [Member] | Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	2,068	130
Futures [Member] | Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	71,245	25,253
Futures [Member] | Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	2,505
Forward, Swap And Spot [Member] | Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	1,097,107	637,847
Forward, Swap And Spot [Member] | Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	2,799
Options Purchased [Member] | Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	13,795	14,299
Options Written [Member] | Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	14,119	14,587
Credit Default Swap Agreements [Member] | Credit Derivative Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	105	155
Stable Value Contracts [Member] | Other Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Notional Amount of Derivatives	$ 41,987	$ 46,758