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Employee Benefit Plans (Amounts Recorded in Accumulated Other Comprehensive Income not yet Recognized) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]      
Balance, beginning of year $ 2,464    
Amortization for the period 69 $ 160 $ 245
Deferrals for the period (274) 3,242  
Impact of foreign currency changes and other (64) (221)  
Balance, end of period 2,795 2,464  
Pension Benefits | Prior Service Cost      
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]      
Balance, beginning of year (2) (5) (10)
Amortization for the period 1 1 3
Deferrals for the period (2) 1 0
Impact of foreign currency changes and other 1 1 2
Balance, end of period (2) (2) (5)
Pension Benefits | Net Actuarial (Gain) Loss      
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]      
Balance, beginning of year 2,466 3,131 3,972
Amortization for the period (69) (160) (245)
Deferrals for the period 411 (431) (545)
Impact of foreign currency changes and other (11) (74) (51)
Balance, end of period 2,797 2,466 3,131
Other Postretirement Benefits      
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]      
Balance, beginning of year 168    
Amortization for the period 10 6 16
Deferrals for the period (66) 364  
Impact of foreign currency changes and other 0 (1)  
Balance, end of period (136) 168  
Other Postretirement Benefits | Prior Service Cost      
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]      
Balance, beginning of year (54) (69) 59
Amortization for the period 7 8 (6)
Deferrals for the period (298) 0 (121)
Impact of foreign currency changes and other 0 7 (1)
Balance, end of period (345) (54) (69)
Other Postretirement Benefits | Net Actuarial (Gain) Loss      
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]      
Balance, beginning of year 222 211 354
Amortization for the period (10) (6) (16)
Deferrals for the period (3) 20 (127)
Impact of foreign currency changes and other 0 (3) 0
Balance, end of period $ 209 $ 222 $ 211