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Pension and Postretirement Benefit Plans - Components of net periodic benefit cost and other information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Non-operating expense |  |  |
Total net periodic benefit cost (benefit) | $ (297) | $ (134) | $ 1
Funded | Postretirement Benefits |  |  |
Operating expense |  |  |
Service cost | 53 | 43 | 43
Non-operating expense |  |  |
Interest cost | 43 | 62 | 82
Expected return on plan assets | (78) | (80) | (78)
Amortization of transition asset | 0 | 0 | 0
Amortization of prior service benefit | (33) | (33) | (33)
Amortization of net actuarial loss | 56 | 47 | 37
Settlements, curtailments, special termination benefits and other | 3 | 3 | 5
Total non-operating expense (benefit) | (9) | (1) | 13
Total net periodic benefit cost (benefit) | 44 | 42 | 56
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Amortization of transition asset | 0 | 0 | 0
Prior service cost (benefit) | 0 | 0 | (171)
Amortization of prior service benefit | 33 | 33 | 33
Net actuarial (gain) loss | (104) | 108 | 117
Amortization of net actuarial loss | (56) | (47) | (37)
Foreign currency | (1) | (7) | (1)
Settlements, curtailments, special termination benefits and other | (3) | (3) | (5)
Total recognized in other comprehensive (income) loss | (131) | 84 | (64)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | (87) | 126 | (8)
Funded | United States | Qualified and Non-Pension Benefits |  |  |
Operating expense |  |  |
Service cost | 286 | 261 | 251
Non-operating expense |  |  |
Interest cost | 360 | 499 | 620
Expected return on plan assets | (1,055) | (1,046) | (1,024)
Amortization of transition asset | 0 | 0 | 0
Amortization of prior service benefit | (24) | (24) | (24)
Amortization of net actuarial loss | 529 | 491 | 398
Settlements, curtailments, special termination benefits and other | 24 | 16 | 70
Total non-operating expense (benefit) | (166) | (64) | 40
Total net periodic benefit cost (benefit) | 120 | 197 | 291
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Amortization of transition asset | 0 | 0 | 0
Prior service cost (benefit) | 0 | 0 | 0
Amortization of prior service benefit | 24 | 24 | 24
Net actuarial (gain) loss | (614) | 760 | 910
Amortization of net actuarial loss | (529) | (491) | (398)
Foreign currency | 0 | 0 | 0
Settlements, curtailments, special termination benefits and other | (23) | (16) | (35)
Total recognized in other comprehensive (income) loss | (1,142) | 277 | 501
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | (1,022) | 474 | 792
Funded | International | Qualified and Non-Pension Benefits |  |  |
Operating expense |  |  |
Service cost | 164 | 152 | 131
Non-operating expense |  |  |
Interest cost | 98 | 117 | 156
Expected return on plan assets | (326) | (306) | (295)
Amortization of transition asset | 2 | 2 | 0
Amortization of prior service benefit | (3) | (5) | (12)
Amortization of net actuarial loss | 104 | 121 | 89
Settlements, curtailments, special termination benefits and other | 3 | 1 | 10
Total non-operating expense (benefit) | (122) | (70) | (52)
Total net periodic benefit cost (benefit) | 42 | 82 | 79
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Amortization of transition asset | (2) | (2) | 0
Prior service cost (benefit) | 1 | 0 | 3
Amortization of prior service benefit | 3 | 5 | 12
Net actuarial (gain) loss | (434) | (358) | 340
Amortization of net actuarial loss | (104) | (121) | (89)
Foreign currency | (71) | 79 | 7
Settlements, curtailments, special termination benefits and other | (1) | (1) | (8)
Total recognized in other comprehensive (income) loss | (608) | (398) | 265
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | $ (566) | $ (316) | $ 344

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