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Derivatives - Narrative (Details)
£ in Billions
1 Months Ended 3 Months Ended
Sep. 20, 2018
GBP (£)
Jan. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Derivative [Line Items]            
Total consideration     $ 245,000,000 $ 177,000,000    
Decrease in net investment hedges     $ 8,000,000      
Senior Notes            
Derivative [Line Items]            
Debt instrument face amount   $ 5,000,000,000        
Foreign Exchange Forward            
Derivative [Line Items]            
Unrealized gain       42,000,000    
Treasury Lock            
Derivative [Line Items]            
Payments for derivative settlement   $ 122,000,000   6,000,000    
Jardine Lloyd Thompson Group plc            
Derivative [Line Items]            
Total consideration | £ £ 5.2          
Jardine Lloyd Thompson Group plc | Senior Notes            
Derivative [Line Items]            
Debt instrument face amount | €         € 1,100,000,000  
Payments for derivative settlement       $ 7,300,000    
Net investment hedge, threshold percentage of the equity balance     80.00%      
Jardine Lloyd Thompson Group plc | Treasury Lock            
Derivative [Line Items]            
Derivative hedges, assets           $ 2,000,000,000