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DEBT - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Long-term debt $ 3,000,000,000 $ 1,500,000,000  
Short-term borrowings $ 3,000,000 4,100,000  
Short-term borrowings weighted average interest rate 34.00%    
Repayments of notes payable $ 0 500,000,000 $ 27,600,000
Line of credit facility, maximum borrowing capacity   750,000,000  
Line of credit facility, gross repayments 446,000,000    
Long-term line of credit, outstanding borrowings   0  
Long-term debt, fair value 3,050,200,000    
Term Loan Agreement | Notes Payable to Banks      
Debt Instrument [Line Items]      
Proceeds from notes payable 1,000,000,000    
Repayments of notes payable 1,000,300,000    
Notes 3.0 Percent Due 2020 and Notes 4.125 Percent Due 2025 | Senior Notes      
Debt Instrument [Line Items]      
Net proceeds 1,487,700,000    
Notes 3.0 Percent Due 2020 | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt $ 750,000,000 $ 0  
Debt instrument, interest rate, stated percentage 3.00% 3.00%  
Public offering price 99.902%    
Notes 4.125 Percent Due 2025 | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt $ 750,000,000 $ 0  
Debt instrument, interest rate, stated percentage 4.125% 4.125%  
Public offering price 99.958%    
Notes 4.60 Percent Due 2044 | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt $ 500,000,000 $ 500,000,000  
Debt instrument, interest rate, stated percentage   4.60%  
Public offering price   99.465%  
Net proceeds   $ 492,000,000  
Notes 4.90 Percent Due 2019 | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt 700,000,000 $ 700,000,000  
Debt instrument, interest rate, stated percentage   4.90%  
Notes 350 Percent Due 2014 | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, payoff amount   $ 503,500,000  
Senior notes   $ 500,000,000.0  
Debt instrument, interest rate, stated percentage   3.50%  
Other Assets | Fair Value Hedging | Interest Rate Swap      
Debt Instrument [Line Items]      
Derivative asset, fair value   $ 0  
Interest Expense | Cash Flow Hedging | Interest Rate Swap | Notes 3.0 Percent Due 2020      
Debt Instrument [Line Items]      
Reduction in interest expense 1,100,000    
Interest Expense | Cash Flow Hedging | Interest Rate Swap | Notes 4.90 Percent Due 2019      
Debt Instrument [Line Items]      
Reduction in interest expense 10,000,000 6,000,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity 750,000,000.0    
Line of credit facility maximum borrowing capacity with request and consent (up to) $ 1,000,000,000    
Line of credit facility, ratio of consolidated adjusted total debt to consolidated EBITDA (not to exceed) 3.5    
Line of credit facility, ratio of consolidated EBITDA to consolidated interest expense (not less than) 3.00    
Line of credit facility, facility fee 0.125%    
Line of credit facility, gross borrowings $ 446,000,000    
Long-term line of credit, outstanding borrowings $ 0    
Revolving Credit Facility | Line of Credit      
Debt Instrument [Line Items]      
Debt Instrument, Term 5 years    
Adjustment to debt for EBITDA calculation $ 500,000,000.0    
Debt Instrument, Covenant Terms, EBITDA Ratio Calculation, Adjustment to Debt, Domestic Unrestricted Cash and Cash Equivalents 100.00%    
Percent of unrestricted cash and cash equivalents used as collateral 65.00%    
Revolving Credit Facility | Minimum      
Debt Instrument [Line Items]      
Debt instrument, margin over base rate 0.00%    
Revolving Credit Facility | Maximum      
Debt Instrument [Line Items]      
Debt instrument, margin over base rate 1.375%    
Designated as Hedging Instrument | Other Liabilities | Fair Value Hedging | Interest Rate Swap      
Debt Instrument [Line Items]      
Fair value adjustment $ (3,500,000) $ (900,000)  
Designated as Hedging Instrument | Other Assets | Fair Value Hedging | Interest Rate Swap      
Debt Instrument [Line Items]      
Derivative asset, fair value $ 3,900,000