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Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Feb. 28, 2014
Dec. 31, 2012
Financial Instruments and Fair Value [Line Items]              
Other-than-temporary impairment losses recognized $ 0 $ 0 $ 0 $ 0      
Gross realized gains on the sale of our marketable securities 54,000,000 33,000,000 235,000,000 189,000,000      
Gross realized losses on the sale of our marketable securities 60,000,000 $ 15,000,000 156,000,000 $ 49,000,000      
Cash collateral received from derivative financial instruments 105,000,000   105,000,000   $ 268,000,000    
Forward-starting interest swaps, anticipated debt issuance amount           $ 1,000,000,000  
Effective portion of our cash flow hedges before tax effect 556,000,000   556,000,000        
Cash flow hedges, expected to be reclassified from AOCI to revenues within the next 12 months 466,000,000   466,000,000        
Interest rate contracts              
Financial Instruments and Fair Value [Line Items]              
Forward-starting interest swaps, notional amount 450,000,000   450,000,000   150,000,000    
Cash Flow Hedging Relationship | Foreign exchange contracts              
Financial Instruments and Fair Value [Line Items]              
Forward-starting interest swaps, notional amount 9,700,000,000   $ 9,700,000,000   13,600,000,000    
Foreign exchange option contracts, maximum maturities (in months)     36 months        
Derivatives in Fair Value Hedging Relationship | Interest rate contracts              
Financial Instruments and Fair Value [Line Items]              
Forward-starting interest swaps, notional amount 290,000,000   $ 290,000,000   175,000,000    
Derivatives in Fair Value Hedging Relationship | Foreign exchange contracts              
Financial Instruments and Fair Value [Line Items]              
Forward-starting interest swaps, notional amount 2,000,000,000   2,000,000,000   1,500,000,000    
Derivatives Not Designated as Hedging Instruments | Interest rate swap              
Financial Instruments and Fair Value [Line Items]              
Forward-starting interest swaps, notional amount             $ 1,000,000,000
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts              
Financial Instruments and Fair Value [Line Items]              
Forward-starting interest swaps, notional amount 5,700,000,000   5,700,000,000   6,200,000,000    
Level 3              
Financial Instruments and Fair Value [Line Items]              
Balance at January 1, 2015 $ 991,000,000   $ 991,000,000   $ 90,000,000