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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
shares
Mar. 31, 2026
$ / shares
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
period
shares
Jun. 30, 2025
USD ($)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Stock-based compensation expenses | $ $ 38   $ 34 $ 89 $ 83
Restricted Stock Units          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Granted (in shares)   1.3      
Vesting period   3 years      
Granted (in dollars per share) | $ / shares   $ 70.78      
Retirement eligibility for employees, minimum years of service required       10 years  
Performance Shares Units          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Granted (in shares)   0.5      
Granted (in dollars per share) | $ / shares   $ 73.28      
Performance period   3 years      
Performance Shares Units | Minimum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Potential target amount received, percentage   0.00%      
Performance Shares Units | Maximum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Potential target amount received, percentage   200.00%      
Annual Performance Shares          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Retirement eligibility for employees, minimum years of service required       1 year  
Expense recognition period       1 year  
Employee Stock          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Discount from market price, purchase date       15.00%  
Number of purchase periods | period       2  
Purchase period       6 months  
Shares authorized for issuance (in shares) 4.0     4.0  
Stock-based compensation expenses | $ $ 0     $ 0