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Employee Benefit Plans (Net Periodic Costs (Income)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Non-operating expense        
Non-service pension income $ (364) $ (374) $ (1,081) $ (1,134)
Pension        
Operating expense        
Service cost 42 47 126 141
Non-operating expense        
Interest cost 587 597 1,756 1,789
Expected return on plan assets (922) (937) (2,760) (2,810)
Amortization of prior service credit (32) (42) (107) (127)
Recognized actuarial net loss 5 5 15 15
Net settlement, curtailment, and special termination benefit loss 0 4 14 0
Non-service pension income (362) (373) (1,082) (1,133)
Total net periodic pension income $ (320) $ (326) $ (956) $ (992)