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Pension and Other Postretirement Benefits - Amounts Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Income before taxes and equity in net earnings of affiliates $ 239   $ 402   $ 400 $ 709
Provision for income taxes (59)   (85)   (101) (163)
Net income 187 $ 122 329 $ 246 309 575
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plans            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Actuarial losses 12   14   24 27
Prior service credit 0   (5)   0 (10)
Income before taxes and equity in net earnings of affiliates 12   9   24 17
Provision for income taxes (3)   (2)   (5) (4)
Net income $ 9   $ 7   $ 19 $ 13