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Retirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Pension, post-retirement and post-employment benefits $ 2,248   $ 2,336
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Contributions by employer 27    
Estimated future employer contributions in current fiscal year 87    
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 37 $ 35  
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Emploer contributions deferred 47    
United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized $ 31 $ 22  
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 60.00%    
Equity Funds | United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, percentage 33.00%    
Actual asset allocation percentage of equity 30.00%    
Fixed Income Funds | United States      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, percentage 36.00%    
Actual asset allocation percentage of equity 40.00%    
Fixed Income Funds | United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, percentage 67.00%    
Actual asset allocation percentage of equity 70.00%