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Retirement Plans (Schedule of Net Periodic Benefit Cost And Other Comprehensive Loss (Earnings) For Pension And Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net periodic benefit cost:      
Recognition of net actuarial loss (gain) (1) Oil, gas and NGL derivatives Oil, gas and NGL derivatives Oil, gas and NGL derivatives
Pension Benefits [Member]      
Net periodic benefit cost:      
Interest cost $ 31 $ 34 $ 19
Expected return on plan assets (27) (27) (31)
Recognition of net actuarial loss (gain) [1] 7 6 6
Total net periodic benefit cost [2] 11 13 (6)
Other comprehensive loss (earnings):      
Actuarial loss (gain) arising in current year 4 16 (11)
Recognition of net actuarial (loss) gain, including settlement expense, in net periodic benefit cost (7) (6) (6)
Total other comprehensive loss (earnings) (3) 10 (17)
Total 8 23 (23)
Postretirement Benefits [Member]      
Net periodic benefit cost:      
Recognition of net actuarial loss (gain) [1] (1) (1) (1)
Total net periodic benefit cost [2] (1) (1) (1)
Other comprehensive loss (earnings):      
Actuarial loss (gain) arising in current year 0 0 (4)
Recognition of net actuarial (loss) gain, including settlement expense, in net periodic benefit cost 1 1 1
Total other comprehensive loss (earnings) 1 1 (3)
Total $ 0 $ 0 $ (4)
[1] These net periodic benefit costs were reclassified out of other comprehensive earnings in the current period.
[2] The service cost component of net periodic benefit cost is included in G&A expense and the remaining components of net periodic benefit costs are included in other, net in the accompanying consolidated statements of comprehensive earnings.