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Derivatives - Narrative (Details)
€ in Billions, £ in Billions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 20, 2018
GBP (£)
Mar. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
EUR (€)
Derivative [Line Items]                  
Total consideration           $ 5,925,000,000 $ 192,000,000    
Increase in cumulative translation adjustments due to gain on net investment hedge       $ 9,000,000   9,000,000      
Foreign Exchange Forward                  
Derivative [Line Items]                  
Unrealized loss       11,000,000          
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         $ 5,568,000,000      
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]                  
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]                  
Payments for derivative settlement   $ 7,300,000              
Proceeds from issuance of debt | €                 € 1.1
Net investment hedge, threshold percentage of the equity balance           80.00%      
Decrease in net investment hedges           $ 9,000,000