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Financial Instruments Derivative Activities Table (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Equity swaps
Derivative [Line Items]
Long Notional Exposure	$ 2
Short Notional Exposure	6,128
Foreign currency forwards
Derivative [Line Items]
Long Notional Exposure	126
Short Notional Exposure	2,162
Interest rate swap contracts
Derivative [Line Items]
Long Notional Exposure	203
Short Notional Exposure	0
Commodity contracts
Derivative [Line Items]
Long Notional Exposure	66
Short Notional Exposure	$ 39

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