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Reclassifications from Accumulated Other Comprehensive Income (AOCI) - Defined Benefit Plan In Other Comprehensive Income (Detail) - 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
Amortization of pension and other benefit items                
Derivative reclassifications to Condensed Consolidated Statements of Operations $ (60) $ 31 $ 20 $ (8) $ (15) $ 5    
Total before tax 2,262     (258)     $ 3,329 $ (1,262)
Tax provision (260)     24     (224) 48
Net of tax 2,002 $ 1,012 $ 91 (234) $ (589) $ (391) 3,105 (1,214)
Amount reclassified from AOCI (a)                
Amortization of pension and other benefit items                
Total before tax 61     39     149 145
Tax provision (15)     (15)     (37) (30)
Net of tax 46     24     112 115
Pension and Other Benefit Items | Amount reclassified from AOCI (a)                
Amortization of pension and other benefit items                
Prior service credits (a) (7)     (1)     (20) (4)
Actuarial losses (a) 23     32     86 96
Settlement, termination and curtailment losses (a) 5     2     6 2
UPI Purchase Accounting Adjustment 0     0     0 23
Total pensions and other benefits items 21     33     72 117
Unrealized (Loss) Gain on Derivatives | Amount reclassified from AOCI (a)                
Amortization of pension and other benefit items                
Derivative reclassifications to Condensed Consolidated Statements of Operations $ 40     $ 6     $ 77 $ 28