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Derivatives - Narrative (Details)
£ in Billions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 20, 2018
GBP (£)
Jan. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
EUR (€)
Mar. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Derivative [Line Items]                
Net investment hedge, threshold percentage of the equity balance       80.00%        
Increase in net investment hedges       $ 60,000,000        
Total consideration       $ 742,000,000 $ 5,925,000,000      
Net Investment Hedging                
Derivative [Line Items]                
Derivative, notional amount | €           € 1,100,000,000    
Senior Notes                
Derivative [Line Items]                
Debt instrument face amount   $ 5,000,000,000            
Foreign Exchange Forward                
Derivative [Line Items]                
Unrealized gain         31,000,000      
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      
Jardine Lloyd Thompson Group plc | Foreign Exchange Forward                
Derivative [Line Items]                
Derivative, loss on derivative         $ 26,000,000      
Jardine Lloyd Thompson Group plc | Treasury Lock                
Derivative [Line Items]                
Derivative hedges, assets               $ 2,000,000,000