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Fair Value and Financial Instruments (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Fair Value
Money market funds and highly liquid debt securities
Recurring
Dec. 31, 2012
Fair Value
Money market funds and highly liquid debt securities
Recurring
Mar. 31, 2013
Fair Value
Money market funds
Recurring
Dec. 31, 2012
Fair Value
Money market funds
Recurring
Mar. 31, 2013
Fair Value
Highly liquid debt securities
Recurring
Dec. 31, 2012
Fair Value
Highly liquid debt securities
Recurring
Mar. 31, 2013
Fair Value
Corporate bonds
Recurring
Dec. 31, 2012
Fair Value
Corporate bonds
Recurring
Mar. 31, 2013
Fair Value
Government bonds.
Recurring
Dec. 31, 2012
Fair Value
Government bonds.
Recurring
Mar. 31, 2013
Fair Value
Equity securities
Recurring
Dec. 31, 2012
Fair Value
Equity securities
Recurring
Mar. 31, 2013
Fair Value
Interest rate contracts
Recurring
Dec. 31, 2012
Fair Value
Interest rate contracts
Recurring
Mar. 31, 2013
Fair Value
Foreign exchange contracts
Recurring
Dec. 31, 2012
Fair Value
Foreign exchange contracts
Recurring
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Money market funds and highly liquid debt securities
Recurring
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Money market funds and highly liquid debt securities
Recurring
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Corporate bonds
Recurring
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Corporate bonds
Recurring
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Government bonds.
Recurring
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Government bonds.
Recurring
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Equity securities
Recurring
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Equity securities
Recurring
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Interest rate contracts
Recurring
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Interest rate contracts
Recurring
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Foreign exchange contracts
Recurring
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Foreign exchange contracts
Recurring
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Money market funds and highly liquid debt securities
Recurring
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Money market funds and highly liquid debt securities
Recurring
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Corporate bonds
Recurring
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Corporate bonds
Recurring
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Government bonds.
Recurring
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Government bonds.
Recurring
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Equity securities
Recurring
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Equity securities
Recurring
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Interest rate contracts
Recurring
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Interest rate contracts
Recurring
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Foreign exchange contracts
Recurring
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Foreign exchange contracts
Recurring
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Money market funds and highly liquid debt securities
Recurring
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Money market funds and highly liquid debt securities
Recurring
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Corporate bonds
Recurring
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Corporate bonds
Recurring
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Government bonds.
Recurring
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Government bonds.
Recurring
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Equity securities
Recurring
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Equity securities
Recurring
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Interest rate contracts
Recurring
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Interest rate contracts
Recurring
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Foreign exchange contracts
Recurring
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Foreign exchange contracts
Recurring
Fair Value Disclosures [Abstract]                                                                                                          
Net assets value (in dollar per share) $ 1                                                                                                        
Assets:                                                                                                          
Money market funds and highly liquid debt securities   $ 2,118 [1] $ 2,133 [2] $ 2,093 $ 2,108 $ 25 $ 25                     $ 2,093 [1] $ 2,108 [2]                     $ 25 [1] $ 25 [2]                     $ 0 [1] $ 0 [2]                    
Other investments               12 12 7 8 4 5             0 0 0 0 4 5             0 0 7 8 0 0             12 12 0 0 0 0        
Derivatives                           16 17 52 193                 0 0 0 0                 16 17 52 193                 0 0 0 0
Liabilities:                                                                                                          
Derivatives                               $ 132 $ 251                     $ 0 $ 0                     $ 132 $ 251                     $ 0 $ 0
[1] Includes $2,093 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 8 “Investments” for additional information regarding the Company’s investments.
[2] Includes $2,108 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 8 “Investments” for additional information regarding the Company’s investments.