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Derivatives - Narrative (Details)
£ in Billions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 18, 2018
GBP (£)
Jan. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 29, 2019
Mar. 30, 2019
Derivative [Line Items]                
Total consideration         $ 1,040,000,000 $ 777,000,000    
Exchange rate       0.0343        
Foreign Exchange Forward                
Derivative [Line Items]                
Unrealized loss       $ 325,000,000        
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 hedge, asset         $ 2,000,000,000      
Forecast                
Derivative [Line Items]                
Exchange rate             0.000145 0.00016
Forecast | Treasury Lock                
Derivative [Line Items]                
Payments for derivative instrument     $ 6,000,000          
Subsequent Event | Treasury Lock                
Derivative [Line Items]                
Payments for derivative instrument   $ 122,000,000            
Senior Notes | Subsequent Event                
Derivative [Line Items]                
Debt instrument, amount   $ 5,000,000,000