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Financial Instruments, AOCL (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative Instruments AOCL Rollforward [Roll Forward]
Beginning Cash Flow Hedges, Effect Net of Tax	$ 26	$ 14	$ 2
Ending Cash Flow Hedges, Effect Net of Tax	$ 26	$ 14	$ 2

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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