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Derivatives - Narrative (Details)
€ in Billions, £ in Billions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 20, 2018
GBP (£)
Mar. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
EUR (€)
Derivative [Line Items]                
Total consideration         $ 177,000,000 $ 36,000,000    
Exchange rate 0.0343              
Foreign Exchange Forward                
Derivative [Line Items]                
Unrealized loss         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 | Treasury Lock                
Derivative [Line Items]                
Unrealized loss             $ 116,000,000  
Derivative hedges, assets             $ 2,000,000,000  
Senior Notes                
Derivative [Line Items]                
Proceeds from issuance of debt     $ 5,000,000,000          
Senior Notes | Jardine Lloyd Thompson Group plc                
Derivative [Line Items]                
Proceeds from issuance of debt | €               € 1.1
Payments for derivative settlement   $ 7,300,000            
Net investment hedge, threshold percentage of the equity balance         80.00%      
Scenario, Forecast | Foreign Exchange Forward                
Derivative [Line Items]                
Unrealized loss       $ 12,000,000