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Derivative Instruments and Hedging Activities (Forward Starting Interest Rate Swaps) (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 28, 2016
Jun. 30, 2016
Dec. 31, 2015
1.900% senior notes due 2017      
Derivative [Line Items]      
Interest rate (as a percentage)   1.90%  
3.950% senior notes due 2020      
Derivative [Line Items]      
Interest rate (as a percentage)   3.95%  
3.250% senior notes due 2022      
Derivative [Line Items]      
Interest rate (as a percentage)   3.25%  
4.000% senior notes due 2023      
Derivative [Line Items]      
Interest rate (as a percentage)   4.00%  
3.625% senior notes due 2024      
Derivative [Line Items]      
Interest rate (as a percentage)   3.625%  
3.875% senior notes due 2025      
Derivative [Line Items]      
Interest rate (as a percentage)   3.875%  
Senior notes | 1.900% senior notes due 2017      
Derivative [Line Items]      
Interest rate (as a percentage)   1.90%  
Senior notes | 2.300% senior notes due 2018      
Derivative [Line Items]      
Interest rate (as a percentage)   2.30%  
Senior notes | 2.250% senior notes due 2019      
Derivative [Line Items]      
Interest rate (as a percentage)   2.25%  
Senior notes | 3.950% senior notes due 2020      
Derivative [Line Items]      
Interest rate (as a percentage)   3.95%  
Senior notes | 3.250% senior notes due 2022      
Derivative [Line Items]      
Interest rate (as a percentage)   3.25%  
Senior notes | 4.000% senior notes due 2023      
Derivative [Line Items]      
Interest rate (as a percentage)   4.00%  
Senior notes | 3.625% senior notes due 2024      
Derivative [Line Items]      
Interest rate (as a percentage)   3.625%  
Senior notes | 3.875% senior notes due 2025      
Derivative [Line Items]      
Interest rate (as a percentage)   3.875%  
Fair value hedges | Designated as hedging instruments | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   $ 3,600.0 $ 3,550.0
Fair value hedges | Senior notes | Designated as hedging instruments | 1.900% senior notes due 2017 | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   300.0 300.0
Fair value hedges | Senior notes | Designated as hedging instruments | 2.300% senior notes due 2018 | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   200.0 200.0
Fair value hedges | Senior notes | Designated as hedging instruments | 2.250% senior notes due 2019 | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   500.0 500.0
Fair value hedges | Senior notes | Designated as hedging instruments | 3.950% senior notes due 2020 | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   500.0 500.0
Fair value hedges | Senior notes | Designated as hedging instruments | 3.250% senior notes due 2022 | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   1,000.0 1,000.0
Fair value hedges | Senior notes | Designated as hedging instruments | 4.000% senior notes due 2023 | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   700.0 700.0
Fair value hedges | Senior notes | Designated as hedging instruments | 3.625% senior notes due 2024 | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   100.0 100.0
Fair value hedges | Senior notes | Designated as hedging instruments | 3.875% senior notes due 2025 | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount   $ 300.0 $ 250.0
Subsequent Event      
Derivative [Line Items]      
Proceeds from derivative settlement $ 195.6    
Subsequent Event | Fair value hedges | Designated as hedging instruments | Interest rate swap agreements      
Derivative [Line Items]      
Notional Amount $ 3,600.0