Financial Instruments Derivative Activities Table (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Equity swaps [Member]
Primary underlying risk:
Long Notional Exposure	$ 4
Short Notional Exposure	11,453
Foreign currency fowards [Member]
Primary underlying risk:
Long Notional Exposure	181
Short Notional Exposure	2,146
Interest rate swap contracts [Member]
Primary underlying risk:
Long Notional Exposure	1,253
Short Notional Exposure	0
Commodity contracts [Member]
Primary underlying risk:
Long Notional Exposure	62
Short Notional Exposure	$ 13