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Employee Benefit Plans (Employee Savings Plans) (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Retirement Benefits [Abstract]      
Contributions to employer sponsored defined contribution plans $ 1,301 $ 1,037 $ 962
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 24.2    
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares 2.3    
Employee Stock Ownership Plan (ESOP), Deferred Shares, Fair Value $ 191    
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits 86.00% 87.00%  
Fair value of plan assets $ 48,945 $ 47,960