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Summary of Significant Accounting Policies - Land, Buildings, Equipment and Software and Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Land, buildings, equipment and software      
Land, buildings, equipment and software, net of accumulated depreciation $ 681 $ 630  
Accumulated depreciation 1,900 1,900  
Depreciation and amortization expense $ 151 $ 142 $ 144
Minimum      
Land, buildings, equipment and software      
Depreciation and amortization period 3 years    
Leases      
Lease renewal term 1 year    
Maximum      
Land, buildings, equipment and software      
Depreciation and amortization period 39 years    
Leases      
Lease renewal term 10 years