Business, Developments, Risks And Uncertainties, Liquidity (Change In Credit Spreads Asset/Liability Products Operations) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
200 Basis Point Decrease [Member]
Estimated change in fair value	$ 266
50 Basis Point Decrease [Member]
Estimated change in fair value	75
50 Basis Point Increase [Member]
Estimated change in fair value	(71)
200 Basis Point Increase [Member]
Estimated change in fair value	$ (265)