Quarterly report pursuant to Section 13 or 15(d)

Debt (Interest Rate Swaps) (Details)

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Debt (Interest Rate Swaps) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Feb. 29, 2016
Interest Rate Swap    
Debt Instrument [Line Items]    
Notional amount of interest rate swap agreements $ 2,350  
Average variable rate, interest rate swap agreements 3.88%  
Weighted average rate, interest rate swap agreements 4.51%  
June 1, 2017 Expiration, Interest Rate Swap    
Debt Instrument [Line Items]    
Notional amount of interest rate swap agreements $ 250  
LIBOR plus 4.22%, Interest Rate Swap    
Debt Instrument [Line Items]    
Notional amount of interest rate swap agreements   $ 600
May 15, 2022 Expiration, Interest Rate Swap    
Debt Instrument [Line Items]    
Notional amount of interest rate swap agreements $ 500  
LIBOR plus 4.44%, Interest Rate Swap    
Debt Instrument [Line Items]    
Notional amount of interest rate swap agreements   $ 1,000