Financial Instruments Derivative Activities Table (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Equity swaps
Primary underlying risk:
Long Notional Exposure	$ 1
Short Notional Exposure	10,508
Foreign currency forwards
Primary underlying risk:
Long Notional Exposure	12
Short Notional Exposure	1,676
Interest rate swap contracts
Primary underlying risk:
Long Notional Exposure	0
Short Notional Exposure	63
Commodity contracts
Primary underlying risk:
Long Notional Exposure	60
Short Notional Exposure	$ 669