Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)

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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Cash and Cash Equivalents, Fair Value Disclosure $ 1,611
Available-for-sale securities 1,639
Financial instrument liabilities 311
Debt 2,837
Quoted Prices In Active Markets For Identical Assets (Level 1)
 
Cash and Cash Equivalents, Fair Value Disclosure 1,611
Available-for-sale securities 1,639
Financial instrument liabilities 282
Debt 0
Significant Other Observable Inputs (Level 2)
 
Cash and Cash Equivalents, Fair Value Disclosure 0
Available-for-sale securities 0
Financial instrument liabilities 29
Debt 2,837
Fair Value, Inputs, Level 3 [Member]
 
Cash and Cash Equivalents, Fair Value Disclosure 0
Available-for-sale securities 0
Financial instrument liabilities 0
Debt $ 0