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Retirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]      
Pension, post-retirement and post-employment benefits $ 2,336 $ 2,163  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Contributions by employer   81  
Estimated future employer contributions in current fiscal year   63  
Jardine Lloyd Thompson Group plc      
Defined Benefit Plan Disclosure [Line Items]      
Pension, post-retirement and post-employment benefits 255    
Pension, post-retirement and post-employment liabilities 1,003    
Pension, post-retirement and post-employment plan assets $ 748    
United States      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized   110 $ 106
United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized   $ 94 $ 74
United Kingdom | Non-U.S. Plans | Geographic Concentration Risk      
Defined Benefit Plan Disclosure [Line Items]      
Concentration risk percentage 81.00%    
Equity Funds | United States      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, percentage   64.00%  
Actual asset allocation percentage of equity   63.00%  
Equity Funds | United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, percentage   33.00%  
Actual asset allocation percentage of equity   33.00%  
Fixed Income Funds | United States      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, percentage   36.00%  
Actual asset allocation percentage of equity   37.00%  
Fixed Income Funds | United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, percentage   67.00%  
Actual asset allocation percentage of equity   67.00%