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Financial Instruments (Details)
3 Months Ended 3 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2012
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2013
Equity Contract [Member]
USD ($)
Mar. 31, 2012
Equity Contract [Member]
USD ($)
Mar. 31, 2013
Hedged Fixed-Rate Debt [Member]
USD ($)
Mar. 31, 2012
Hedged Fixed-Rate Debt [Member]
USD ($)
Mar. 31, 2013
Interest Rate Contract [Member]
USD ($)
Mar. 31, 2012
Interest Rate Contract [Member]
USD ($)
Mar. 31, 2013
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Interest Rate Contract [Member]
USD ($)
Dec. 31, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Interest Rate Contract [Member]
USD ($)
Mar. 31, 2013
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Foreign Exchange Contract [Member]
USD ($)
Mar. 31, 2013
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Dec. 31, 2012
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Mar. 31, 2013
Fair Value, Inputs, Level 1 [Member]
USD ($)
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
USD ($)
Mar. 31, 2013
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
USD ($)
Mar. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Interest Rate Contract [Member]
USD ($)
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Interest Rate Contract [Member]
USD ($)
Mar. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Exchange Contract [Member]
USD ($)
Mar. 31, 2013
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Estimate of Fair Value, Fair Value Disclosure [Member]
Interest Rate Contract [Member]
USD ($)
Dec. 31, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]
Interest Rate Contract [Member]
USD ($)
Mar. 31, 2013
Estimate of Fair Value, Fair Value Disclosure [Member]
Foreign Exchange Contract [Member]
USD ($)
Dec. 31, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]
Foreign Exchange Contract [Member]
USD ($)
Mar. 31, 2013
Corporate Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Corporate Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Corporate Debt Securities [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Dec. 31, 2012
Corporate Debt Securities [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Mar. 31, 2013
Corporate Debt Securities [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Mar. 31, 2013
Corporate Debt Securities [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Corporate Debt Securities [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
US Government Agencies Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
US Government Agencies Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
US Government Agencies Debt Securities [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Dec. 31, 2012
US Government Agencies Debt Securities [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Mar. 31, 2013
US Government Agencies Debt Securities [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Dec. 31, 2012
US Government Agencies Debt Securities [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Mar. 31, 2013
US Government Agencies Debt Securities [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2012
US Government Agencies Debt Securities [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Mar. 31, 2013
US Government Agencies Debt Securities [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
US Government Agencies Debt Securities [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Other Debt Obligations [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Other Debt Obligations [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Other Debt Obligations [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Dec. 31, 2012
Other Debt Obligations [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Mar. 31, 2013
Other Debt Obligations [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2012
Other Debt Obligations [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Mar. 31, 2013
Other Debt Obligations [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Other Debt Obligations [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Collateralized Mortgage Backed Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Collateralized Mortgage Backed Securities [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Mar. 31, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Mar. 31, 2013
Collateralized Mortgage Backed Securities [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Collateralized Mortgage Backed Securities [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Asset-backed Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Asset-backed Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Asset-backed Securities [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Dec. 31, 2012
Asset-backed Securities [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Mar. 31, 2013
Asset-backed Securities [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Mar. 31, 2013
Asset-backed Securities [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Asset-backed Securities [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Equity Securities, US [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Equity Securities, US [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Equity Securities, US [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Dec. 31, 2012
Equity Securities, US [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Mar. 31, 2013
Equity Securities, US [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Dec. 31, 2012
Equity Securities, US [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Mar. 31, 2013
Equity Securities, US [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Equity Securities, US [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Equity Method and Other Investments [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2012
Equity Method and Other Investments [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Mar. 31, 2013
Equity Method and Other Investments [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Dec. 31, 2012
Equity Method and Other Investments [Member]
Available-for-Sale Securities, Amortized Cost [Member]
USD ($)
Mar. 31, 2013
Buy British pound Sell euro [Member]
EUR (€)
Mar. 31, 2013
Buy British pound Sell euro [Member]
GBP (£)
Mar. 31, 2013
Buy US dollar Sell euro [Member]
USD ($)
Mar. 31, 2013
Buy US dollar Sell euro [Member]
EUR (€)
Mar. 31, 2013
Buy euro Sell US dollar [Member]
USD ($)
Mar. 31, 2013
Buy euro Sell US dollar [Member]
EUR (€)
Available-for-sale Securities, Debt Securities $ 5,991,200,000                                                                                                                                                                                    
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge           (69,000,000) (65,900,000)                                                                                                                                                                        
Cash and Cash Equivalents, Fair Value Disclosure                   3,936,600,000 4,018,800,000         3,936,600,000 4,018,800,000 3,907,200,000 3,964,400,000 29,400,000 54,400,000         3,936,600,000 4,018,800,000                                                                                                                                
Long-term Debt                   (5,459,600,000) (5,531,300,000)                 (5,886,400,000) (5,996,600,000)         (5,886,400,000) (5,996,600,000)                                                                                                                                
Derivative Assets, Current                       16,600,000   6,900,000 11,000,000             16,600,000   6,900,000 11,000,000     16,600,000   6,900,000 11,000,000                                                                                                                        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Percentage of Nonperforming Assets 80.00%                                                                                                                                                                                    
Notional Amount of Foreign Currency Derivative Purchase Contracts                                                                                                                                                                             162,900,000 510,300,000     456,400,000
Notional Amount of Foreign Currency Derivative Sale Contracts                                                                                                                                                                           190,700,000     397,100,000 589,500,000  
Maximum Remaining Maturity of Foreign Currency Derivatives 30 days                                                                                                                                                                                    
Description of Derivative Activity Volume Percent 60.00%                                                                                                                                                                                    
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments               69,000,000 65,900,000                                                                                                                                                                    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 9,000,000                                                                                                                                                                                    
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion 2,200,000 2,200,000                                                                                                                                                                                  
Derivative Instruments, Gain (Loss) Recognized in Income, Net 100,000 (32,800,000)                                                                                                                                                                                  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net       1,100,000 0                                                                                                                                                                            
Derivative Assets, Noncurrent                       503,800,000 589,400,000                 503,800,000 589,400,000         503,800,000 589,400,000                                                                                                                            
Derivative Liabilities, Current                           (7,900,000) (17,500,000)                 (7,900,000) (17,500,000)         (7,900,000) (17,500,000)                                                                                                                        
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 4,004,400,000                                                                                                                                                                                    
Available-for-sale Securities, Gross Unrealized Gains 162,600,000   140,500,000                                                                                                                                                                                
Available-for-sale Securities, Gross Unrealized Losses 23,400,000   29,000,000                                                                                                                                                                                
Available-for-sale Securities, Continuous Unrealized Gain Position, Fair Value 4,248,200,000   5,246,000,000                                                                                                                                                                                
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,707,900,000   2,102,000,000                                                                                                                                                                                
Other than Temporary Impairment Losses, Investments 5,200,000 3,700,000                                                                                                                                                                                  
Proceeds from Sale and Maturity of Available-for-sale Securities 3,705,900,000 2,383,400,000                                                                                                                                                                                  
Available-for-sale Securities, Gross Realized Gains 10,000,000 13,700,000                                                                                                                                                                                  
Available-for-sale Securities, Gross Realized Losses 2,500,000 2,700,000                                                                                                                                                                                  
Available-for-sale Securities, Current [Abstract]                                                                                                                                                                                      
Available-for-sale Securities, Debt Securities, Current                                                               709,000,000 1,503,500,000 707,100,000 1,501,500,000 709,000,000 1,503,500,000 709,000,000 1,503,500,000 84,200,000 150,200,000 84,100,000 150,200,000 84,200,000 150,200,000     84,200,000 150,200,000 2,600,000 11,800,000 2,600,000 11,800,000 2,600,000 11,800,000 2,600,000 11,800,000                                                                    
Available-for-sale Securities, Current, Total                   795,800,000 1,665,500,000         793,800,000 1,663,500,000                                                                                                                                                    
Available-for-sale Securities, Noncurrent [Abstract]                                                                                                                                                                                      
Available-for-sale Securities, Debt Securities, Noncurrent                                                               3,350,200,000 3,351,300,000 3,324,600,000 3,322,900,000 3,350,200,000 3,351,300,000 3,350,200,000 3,351,300,000 849,200,000 1,362,700,000 847,200,000 1,360,300,000 756,600,000 1,122,400,000 92,600,000 240,300,000 849,200,000 1,362,700,000 7,800,000 3,300,000 8,000,000 3,300,000 7,800,000 3,300,000 7,800,000 3,300,000 634,600,000 668,100,000 639,900,000 677,700,000 634,600,000 668,100,000 634,600,000 668,100,000 358,200,000 519,000,000 360,800,000 523,500,000 358,200,000 519,000,000 358,200,000 519,000,000                                    
Available-for-sale Securities, Equity Securities, Noncurrent                                                                                                                                                   200,500,000 175,800,000 82,800,000 83,000,000 200,500,000 175,800,000 200,500,000 175,800,000                    
Other Long-term Investments                                                                                                                                                                   235,700,000 233,100,000 235,700,000 233,100,000            
Available-for-sale Securities, Noncurrent, Total                   5,636,200,000 6,313,300,000         5,499,000,000 6,203,800,000                                                                                                                                                    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 795,800,000                                                                                                                                                                                    
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 452,700,000                                                                                                                                                                                    
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value $ 738,300,000