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Retirement Benefits (Narrative) (Details)
1 Months Ended 12 Months Ended
Jan. 01, 2017
Nov. 30, 2016
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
plan
Dec. 31, 2017
USD ($)
Nov. 30, 2019
GBP (£)
Defined Benefit Plan Disclosure [Line Items]            
Period to recognize gains or losses on market-related value of assets     5 years      
Assumed health care cost trend rate for Medicare eligibles and non-Medicare eligibles     4.98%      
Future assumed health care cost trend rate     4.34%      
Automatic employer contribution of employee's eligible base pay (as a percent) 4.00%          
401(k) Plan's assets invested in common stock     $ 556,000,000 $ 444,000,000    
U.S.            
Defined Benefit Plan Disclosure [Line Items]            
Effect on total of service and interest cost components 1 Percentage Point Increase     0      
Effect on postretirement benefit obligation 1 Percentage Point Increase     0      
Effect on postretirement benefit obligation 1 Percentage Point Decrease     0      
Effect on total of service and interest cost components 1 Percentage Point Decrease     0      
Expected employer contributions in 2020     76,000,000      
Cost of defined contribution plans     $ 139,000,000 133,000,000 $ 130,000,000  
U.S. | Equities and equity alternatives            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     64.00%      
Actual asset allocation percentage     64.00%      
U.S. | Fixed income            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     36.00%      
Actual asset allocation percentage     36.00%      
Non-U.S.            
Defined Benefit Plan Disclosure [Line Items]            
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets     $ 2,900,000,000 1,700,000,000    
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets     2,700,000,000 1,600,000,000    
Aggregate fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets     2,200,000,000 1,300,000,000    
Fair value of plan assets for plans with projected benefit obligations in excess of plan assets     2,300,000,000 1,600,000,000    
Projected benefit obligation for plans with projected benefit obligations in excess of plan assets     3,000,000,000.0 1,900,000,000    
Effect on total of service and interest cost components 1 Percentage Point Increase     0      
Effect on postretirement benefit obligation 1 Percentage Point Increase     6,000,000      
Effect on postretirement benefit obligation 1 Percentage Point Decrease     (5,000,000)      
Effect on total of service and interest cost components 1 Percentage Point Decrease     0      
Cost of defined contribution plans     $ 100,000,000 80,000,000 75,000,000  
United Kingdom | Equities and equity alternatives            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     34.00%      
Actual asset allocation percentage     35.00%      
United Kingdom | Fixed income            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     66.00%      
Actual asset allocation percentage     65.00%      
Pension and Postretirement Benefits | U.S.            
Defined Benefit Plan Disclosure [Line Items]            
Assumed health care cost trend rate for Medicare eligibles and non-Medicare eligibles     6.00%      
Future assumed health care cost trend rate     4.50%      
Cap on employer share of health care trend (as a percent)     5.00%      
Pension Benefits | U.S.            
Defined Benefit Plan Disclosure [Line Items]            
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets     $ 6,300,000,000 5,500,000,000    
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets     6,300,000,000 5,500,000,000    
Aggregate fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets     4,700,000,000 4,100,000,000    
Fair value of plan assets for plans with projected benefit obligations in excess of plan assets     4,700,000,000 4,100,000,000    
Projected benefit obligation for plans with projected benefit obligations in excess of plan assets     6,300,000,000 $ 5,500,000,000    
Pension Benefits | Non-U.S.            
Defined Benefit Plan Disclosure [Line Items]            
Non-cash settlement charges     7,000,000      
Expected employer contributions in 2020     $ 84,000,000      
Pension Benefits | United Kingdom            
Defined Benefit Plan Disclosure [Line Items]            
Number of plans in which lump sum payments exceeded settlement thresholds | plan       2    
Non-cash settlement charges       $ 42,000,000 $ 54,000,000  
Period between legally-prescribed negotiations between the Company and the plans' trustee     3 years      
Post-retirement Benefits | U.S.            
Defined Benefit Plan Disclosure [Line Items]            
Number of shares held in defined benefit plan | shares     2,000,000      
Change in plan assets (as a percent)     4.80%      
JLT Transaction            
Defined Benefit Plan Disclosure [Line Items]            
Net pension liabilities assumed as part of the JLT Transaction     $ 255,000,000      
Liabilities assumed as part of the JLT Transaction     1,003,000,000      
Plan assets assumed as part of the JLT Transaction     $ 748,000,000      
Minimum | U.S. | Equities and equity alternatives            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     59.00%      
Minimum | U.S. | Fixed income            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     31.00%      
Minimum | United Kingdom | Equities and equity alternatives            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     31.00%      
Minimum | United Kingdom | Fixed income            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     63.00%      
Maximum | U.S. | Equities and equity alternatives            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     69.00%      
Maximum | U.S. | Fixed income            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     41.00%      
Maximum | United Kingdom | Equities and equity alternatives            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     37.00%      
Maximum | United Kingdom | Fixed income            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage     69.00%      
Pension Plan Funded Status Guarantee | Non-U.S.            
Defined Benefit Plan Disclosure [Line Items]            
Annual deficit contributions, period   7 years        
Pension Plan Funded Status Guarantee | United Kingdom            
Defined Benefit Plan Disclosure [Line Items]            
Annual deficit contributions (GBP) | £           £ 450,000,000
United Kingdom Pension and Postretirement Benefit Plan, Defined Benefit | Geographic Concentration Risk | United Kingdom            
Defined Benefit Plan Disclosure [Line Items]            
Concentration risk (as a percent)     81.00%      
JLT U.K. Plan | Pension Benefits | United Kingdom            
Defined Benefit Plan Disclosure [Line Items]            
Expected employer contributions in 2020     $ 28,000,000