Financial Instruments Derivative Activities Table (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Equity swaps
Primary underlying risk:
Long Notional Exposure	$ 2
Short Notional Exposure	6,951
Foreign currency forwards
Primary underlying risk:
Long Notional Exposure	160
Short Notional Exposure	2,197
Interest rate swap contracts
Primary underlying risk:
Long Notional Exposure	1,253
Short Notional Exposure	0
Commodity contracts
Primary underlying risk:
Long Notional Exposure	52
Short Notional Exposure	$ 21