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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Total revenue $ 3,219 $ 3,143
United States    
Disaggregation of Revenue [Line Items]    
Total revenue 1,227 1,161
Americas other than United States    
Disaggregation of Revenue [Line Items]    
Total revenue 228 226
United Kingdom    
Disaggregation of Revenue [Line Items]    
Total revenue 500 452
Europe, Middle East, & Africa other than United Kingdom    
Disaggregation of Revenue [Line Items]    
Total revenue 978 1,009
Asia Pacific    
Disaggregation of Revenue [Line Items]    
Total revenue 286 295
Operating Segments | Commercial Risk Solutions    
Disaggregation of Revenue [Line Items]    
Total revenue 1,146 1,118
Operating Segments | Reinsurance Solutions    
Disaggregation of Revenue [Line Items]    
Total revenue 848 788
Operating Segments | Retirement Solutions    
Disaggregation of Revenue [Line Items]    
Total revenue 397 420
Operating Segments | Health Solutions    
Disaggregation of Revenue [Line Items]    
Total revenue 502 486
Operating Segments | Data & Analytic Services    
Disaggregation of Revenue [Line Items]    
Total revenue 331 336
Elimination    
Disaggregation of Revenue [Line Items]    
Total revenue $ (5) $ (5)