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
Mar. 31, 2013
Cash and Cash Equivalents, Fair Value Disclosure $ 1,012
Available-for-sale securities 2,373
Debt 2,813
Quoted Prices In Active Markets For Identical Assets (Level 1)
 
Cash and Cash Equivalents, Fair Value Disclosure 970
Available-for-sale securities 1,857
Debt 0
Significant Other Observable Inputs (Level 2)
 
Cash and Cash Equivalents, Fair Value Disclosure 42
Available-for-sale securities 516
Debt 2,813
Fair Value, Inputs, Level 3 [Member]
 
Cash and Cash Equivalents, Fair Value Disclosure 0
Available-for-sale securities 0
Debt $ 0