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Derivative Instruments and Hedging Activities - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
May 01, 2018
USD ($)
Mar. 01, 2017
USD ($)
Derivative
Dec. 31, 2016
USD ($)
Derivative
Designated as hedging instrument | Forward contracts        
Derivative [Line Items]        
Derivative, notional amount $ 98      
Derivative, remaining maturity 24 months      
Not designated as hedging instrument | Interest rate swaps        
Derivative [Line Items]        
Number of interest rate derivatives held | Derivative       4
Derivative, notional amount       $ 1,450
Derivative, swaption interest rate       1.87%
Not designated as hedging instrument | Forward contracts        
Derivative [Line Items]        
Derivative, notional amount $ 412      
Interest Rate Swaps Maturing 2022 [Member] | Designated as hedging instrument | Interest rate swaps        
Derivative [Line Items]        
Number of interest rate derivatives entered into | Derivative     2  
Derivative, maturity date Mar. 01, 2022      
Interest Rate Swaps Maturing 2022 [Member] | $1.6 billion notional [member] | Designated as hedging instrument | Interest rate swaps        
Derivative [Line Items]        
Derivative, notional amount     $ 1,600  
Derivative, swaption interest rate     1.98%  
Interest Rate Swaps Maturing 2022 [Member] | $750 million notional [member] | Designated as hedging instrument | Interest rate swaps        
Derivative [Line Items]        
Derivative, notional amount     $ 750  
Proceeds received for settlement of interest rate swap $ 18      
Derivative, swaption interest rate     2.02%  
Interest Rate Swaps Maturing 2023 [Member] | $1.6 billion notional [member] | Designated as hedging instrument | Interest rate swaps        
Derivative [Line Items]        
Derivative, notional amount   $ 1,600    
Derivative, term March 2022 to March 2023      
Derivative, swaption interest rate   3.03%