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Retirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mar. 31, 2019
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Contributions by employer $ 85      
Estimated future employer contributions in current fiscal year 32      
Jardine Lloyd Thompson Group plc        
Defined Benefit Plan Disclosure [Line Items]        
Pension, post-retirement and post-employment liabilities       $ 248
Pension, post-retirement and post-employment plan assets       $ 700
United States        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, cost recognized $ 106 $ 100    
United States | Equity Funds        
Defined Benefit Plan Disclosure [Line Items]        
Target asset allocation, percentage 64.00%      
Actual asset allocation percentage of equity 62.00%      
United States | Fixed Income Funds        
Defined Benefit Plan Disclosure [Line Items]        
Target asset allocation, percentage 36.00%      
Actual asset allocation percentage of equity 38.00%      
United Kingdom        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, cost recognized $ 74 $ 61    
United Kingdom | Equity Funds        
Defined Benefit Plan Disclosure [Line Items]        
Target asset allocation, percentage 36.00%      
Actual asset allocation percentage of equity 33.00%      
United Kingdom | Fixed Income Funds        
Defined Benefit Plan Disclosure [Line Items]        
Target asset allocation, percentage 64.00%      
Actual asset allocation percentage of equity 67.00%      
United Kingdom | Geographic Concentration Risk | Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Concentration risk percentage     81.00%