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Financial Instruments (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 1,667.4 $ 2,986.8
Short-term commercial paper borrowings (1,423.7) (1,299.3)
Long-term debt, including current portion (11,318.1) (9,419.1)
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 521.0 287.4
Short-term commercial paper borrowings (1,423.7) (1,299.3)
Long-term debt, including current portion (11,318.1) (9,419.1)
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0.0 0.0
Short-term commercial paper borrowings 0.0 0.0
Long-term debt, including current portion 0.0 0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,146.4 2,699.4
Short-term commercial paper borrowings 0.0 0.0
Long-term debt, including current portion 0.0 0.0
Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,667.4 2,986.8
Short-term investments: 2,364.2 1,456.5
Noncurrent investments: 5,723.3 5,207.5
Short-term commercial paper borrowings (1,425.0) (1,299.3)
Long-term debt, including current portion (10,887.1) (9,005.9)
Portion at Other than Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [1] 1,667.4 2,986.8
U.S. government and agency securities | Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 671.6 232.5
Noncurrent investments, debt securities 365.1 318.9
U.S. government and agency securities | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 0.0 0.0
Noncurrent investments, debt securities 0.0 0.0
U.S. government and agency securities | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 0.0 0.0
Noncurrent investments, debt securities 0.0 0.0
U.S. government and agency securities | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 671.6 232.5
Noncurrent investments, debt securities 365.1 318.9
U.S. government and agency securities | Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 671.6 232.5
Noncurrent investments, debt securities 365.1 318.9
U.S. government and agency securities | Portion at Other than Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities [1] 672.0 232.6
Noncurrent investments, debt securities 368.1 [1] 323.8
Corporate debt securities | Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 1,688.4 1,219.2
Noncurrent investments, debt securities 3,493.6 3,062.2
Corporate debt securities | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 1,688.4 1,219.2
Noncurrent investments, debt securities 3,493.6 3,062.2
Corporate debt securities | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 0.0 0.0
Noncurrent investments, debt securities 0.0 0.0
Corporate debt securities | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 0.0 0.0
Noncurrent investments, debt securities 0.0 0.0
Corporate debt securities | Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 1,688.4 1,219.2
Noncurrent investments, debt securities 3,493.6 3,062.2
Corporate debt securities | Portion at Other than Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities [1] 1,688.1 1,219.1
Noncurrent investments, debt securities [1] 3,488.3 3,074.3
Mortgage-backed securities | Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments, debt securities 152.2 183.1
Mortgage-backed securities | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments, debt securities 152.2 183.1
Mortgage-backed securities | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments, debt securities 0.0 0.0
Mortgage-backed securities | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments, debt securities 0.0 0.0
Mortgage-backed securities | Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments, debt securities 152.2 183.1
Mortgage-backed securities | Portion at Other than Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments, debt securities [1] 153.4 185.4
Asset-backed securities | Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 2.0 4.3
Noncurrent investments, debt securities 678.9 502.7
Asset-backed securities | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 2.0 4.3
Noncurrent investments, debt securities 678.9 502.7
Asset-backed securities | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 0.0 0.0
Noncurrent investments, debt securities 0.0 0.0
Asset-backed securities | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 0.0 0.0
Noncurrent investments, debt securities 0.0 0.0
Asset-backed securities | Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 2.0 4.3
Noncurrent investments, debt securities 678.9 502.7
Asset-backed securities | Portion at Other than Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities [1] 2.0 4.3
Noncurrent investments, debt securities [1] 679.4 503.5
Other securities | Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 2.2 0.5
Noncurrent investments, debt securities 173.6 153.7
Other securities | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 2.2 0.5
Noncurrent investments, debt securities 0.0 0.0
Other securities | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 0.0 0.0
Noncurrent investments, debt securities 173.6 153.7
Other securities | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 0.0 0.0
Noncurrent investments, debt securities 0.0 0.0
Other securities | Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities 2.2 0.5
Noncurrent investments, debt securities 173.6 153.7
Other securities | Portion at Other than Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments, debt securities [1] 2.2 0.5
Noncurrent investments, debt securities [1] 81.3 77.6
Marketable equity securities | Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 326.7 418.2
Marketable equity securities | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 0.0 0.0
Marketable equity securities | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 0.0 0.0
Marketable equity securities | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 326.7 418.2
Marketable equity securities | Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 326.7 418.2
Marketable equity securities | Portion at Other than Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities [1] 122.4 91.9
Cost and equity method investments | Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost and equity method investments [2] $ 533.2 $ 568.7
[1] (1) For available-for-sale debt securities, amounts disclosed represent the securities' amortized cost.
[2] (2) Fair value disclosures are not applicable for cost method and equity method investments.