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Quarterly report pursuant to Section 13 or 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 04, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý Ìý Ìý Ìý
OPEB contributions Ìý $ 22 Ìý $ 27 Ìý
Pension Plan Ìý Ìý Ìý Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý Ìý Ìý Ìý
Service cost Ìý 14 $ 5 42 $ 16
Interest cost Ìý 26 20 78 43
Expected return on plan assets Ìý (89) (38) (269) (93)
Prior service credits Ìý 1 1 1 1
Net actuarial loss Ìý 8 8 24 21
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total Ìý (40) (4) (124) (12)
Defined benefit pension contributions $ 118 1 1 154 5
Other Postretirement Benefit Plans, Defined Benefit Ìý Ìý Ìý Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý Ìý Ìý Ìý
Service cost Ìý 13 1 38 3
Interest cost Ìý 19 4 56 11
Expected return on plan assets Ìý (10) (4) (30) (13)
Prior service credits Ìý (2) (1) (2) (2)
Net actuarial loss Ìý 1 1 3 2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total Ìý $ 21 1 $ 65 1
OPEB contributions Ìý Ìý $ 0 Ìý $ 0