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v3.21.2

Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 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 |  |  |  | $ 38 | $ 64 |
PRB plans | $ 5 | $ 8 |  | 9 | 8 |
Defined contribution plans | 221 | 228 |  | 730 | 668 |
Liability, Defined Benefit Plan, Current | 314 |  |  | 314 |  | $ 314
Liability, Defined Benefit Pension Plan, Noncurrent | 9,742 |  |  | 9,742 |  | 10,342
Non-service pension (income) expense | (491) | (253) |  | (1,472) | (658) |
Total net periodic benefit (income) expense |  |  |  | (1,073) | (325) |
Marketable securities held in trusts | 965 |  |  | 965 |  | 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 | 8 | 14 |  | 29 | 56 |
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan | 1,389 |  |  | 1,389 |  | 424
Liability, Defined Benefit Pension Plan, Noncurrent | 8,638 |  |  | 8,638 |  | 9,131
Service cost | 131 | 149 |  | 393 | 328 |
Interest cost | 312 | 465 |  | 937 | 1,170 |
Expected return on plan assets | (869) | (827) |  | (2,608) | (2,162) |
Amortization of prior service cost (credit) | (42) | 13 |  | (126) | 39 |
Recognized actuarial net loss (gain) | 109 | 86 |  | 327 | 255 |
Net settlement, curtailment and special termination benefit loss | 1 | 8 |  | 4 | 35 |
Non-service pension (income) expense | (489) | (255) |  | (1,466) | (663) |
Total net periodic benefit (income) expense | (358) | (106) |  | (1,073) | (335) |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Liability, Defined Benefit Pension Plan, Noncurrent | 1,039 |  |  | 1,039 |  | 1,072
Service cost | 2 | 2 |  | 6 | 5 |
Interest cost | 6 | 10 |  | 18 | 26 |
Expected return on plan assets | (5) | (4) |  | (15) | (9) |
Amortization of prior service cost (credit) | (1) | (1) |  | (3) | (3) |
Recognized actuarial net loss (gain) | (2) | (3) |  | (6) | (9) |
Net settlement, curtailment and special termination benefit loss | 0 | 0 |  | 0 | 0 |
Non-service pension (income) expense | (2) | 2 |  | (6) | 5 |
Total net periodic benefit (income) expense | 0 | $ 4 |  | 0 | $ 10 |
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 | $ 65 |  |  | $ 65 |  | $ 139

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