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Pension and Other Postretirement Benefits - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Income from continuing operations before taxes $ 285     $ 248     $ 867 $ 502
Income Tax Expense (Benefit) (74)     (70)     (285) (143)
Net income from continuing operations 216     179     592 363
Net (loss) / income from discontinued operations (85)     66     (43) 137
Net income 131 $ 173 $ 245 245 $ 141 $ 114 549 500
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plans                
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Actuarial losses 24     20     75 63
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 0     5     0 61
Prior service credit (5)     (5)     (18) (18)
Income from continuing operations before taxes 19     20     57 106
Income Tax Expense (Benefit) (5)     (5)     (13) (21)
Net income from continuing operations 14     15     44 85
Net (loss) / income from discontinued operations 9           9  
Net income $ 23     $ 15     $ 53 $ 85