Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 14,220
Remaining Life - 1 - 5 Years	25,085
Remaining Life - 6 - 10 Years	18,258
Remaining Life - 11 - 30 Years	9,753
Remaining Life Over - 30 Years	1,215
Remaining Life - Total Years	68,531
Interest Rate Contract [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	3,967	[1]
Remaining Life - 1 - 5 Years	20,890	[1]
Remaining Life - 6 - 10 Years	12,793	[1]
Remaining Life - 11 - 30 Years	9,593	[1]
Remaining Life Over - 30 Years	1,213	[1]
Remaining Life - Total Years	48,456	[1]
Derivative maturity date	Apr. 01, 2067
Foreign Exchange Contract [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	48	[2]
Remaining Life - 1 - 5 Years	150	[2]
Remaining Life - 6 - 10 Years	243	[2]
Remaining Life - 11 - 30 Years	139	[2]
Remaining Life Over - 30 Years		[2]
Remaining Life - Total Years	580	[2]
Derivative maturity date	Apr. 01, 2028
Equity Market Contract [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	10,205
Remaining Life - 1 - 5 Years	3,897
Remaining Life - 6 - 10 Years	5,222
Remaining Life - 11 - 30 Years	21
Remaining Life Over - 30 Years	2
Remaining Life - Total Years	19,347
Credit Risk Contract [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year
Remaining Life - 1 - 5 Years	148
Remaining Life - 6 - 10 Years
Remaining Life - 11 - 30 Years
Remaining Life Over - 30 Years
Remaining Life - Total Years	$ 148

[1] As of June 30, 2013, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 2067.

[2] As of June 30, 2013, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 2028.