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v3.21.2

Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plan, benefit obligation, increase (decrease) due to remeasurement |  | $ 2,400 |  |  |
Defined benefit plans |  |  | $ 25 | $ 42 |
PRB plans | $ 4 | 0 | 4 | 0 |
Defined contribution plans | 238 | 227 | 509 | 440 |
Liability, Defined Benefit Plan, Current | 314 |  | 314 |  | $ 314
Liability, Defined Benefit Pension Plan, Noncurrent | 9,929 |  | 9,929 |  | 10,342
Non-service pension (income) expense | (490) | (237) | (981) | (405) |
Total net periodic benefit (income) expense |  |  | (715) | (223) |
Marketable securities held in trusts |  |  |  |  | 881
UNITED STATES |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plans | 0 | 0 | 0 | 0 |
Foreign Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plans | 14 | 34 | 21 | 42 |
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan | 1,069 |  | 1,069 |  | 424
Liability, Defined Benefit Pension Plan, Noncurrent | 8,805 |  | 8,805 |  | 9,131
Service cost | 131 | 142 | 262 | 179 |
Interest cost | 313 | 452 | 625 | 705 |
Expected return on plan assets | (871) | (814) | (1,739) | (1,335) |
Amortization of prior service cost (credit) | (42) | 13 | (84) | 26 |
Recognized actuarial net loss (gain) | 109 | 83 | 218 | 169 |
Net settlement, curtailment and special termination benefit loss | 3 | 27 | 3 | 27 |
Non-service pension (income) expense | (488) | (239) | (977) | (408) |
Total net periodic benefit (income) expense | (357) | (97) | (715) | (229) |
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Liability, Defined Benefit Pension Plan, Noncurrent | 1,058 |  | 1,058 |  | 1,072
Service cost | 2 | 2 | 4 | 3 |
Interest cost | 6 | 10 | 12 | 16 |
Expected return on plan assets | (5) | (4) | (10) | (5) |
Amortization of prior service cost (credit) | (1) | (1) | (2) | (2) |
Recognized actuarial net loss (gain) | (2) | (3) | (4) | (6) |
Net settlement, curtailment and special termination benefit loss | 0 | 0 | 0 | 0 |
Non-service pension (income) expense | (2) | 2 | (4) | 3 |
Total net periodic benefit (income) expense | 0 | $ 4 | 0 | $ 6 |
Other pension and PRB related items |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Liability, Defined Benefit Pension Plan, Noncurrent | $ 66 |  | $ 66 |  | $ 139

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