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Benefit Plans - Pension Plans (Details) - Pension Plans - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Simplify to Grow Program |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement losses and other expenses |  | $ 1 | $ 4 | $ 1 | $ 4
U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 2 | 2 | 4 | 3
Interest cost |  | 10 | 13 | 20 | 26
Expected return on plan assets |  | (18) | (20) | (36) | (39)
Net loss from experience differences |  | 5 | 4 | 9 | 8
Prior service benefit |  | 0 | 0 | 0 | 0
Curtailment credit | [1] | 0 | 0 | 0 | 0
Settlement losses and other expenses | [2] | 6 | 8 | 9 | 12
Net periodic benefit cost (credit) |  | 5 | 7 | 6 | 10
Non-U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 35 | 29 | 70 | 59
Interest cost |  | 30 | 36 | 59 | 73
Expected return on plan assets |  | (107) | (96) | (213) | (195)
Net loss from experience differences |  | 33 | 28 | 66 | 57
Prior service benefit |  | (1) | (1) | (3) | (3)
Curtailment credit | [1] | (14) | 0 | (14) | 0
Settlement losses and other expenses | [2] | 0 | 0 | 0 | 2
Net periodic benefit cost (credit) |  | (24) | $ (4) | (35) | $ (7)
U.K. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment credit |  | (14) |  | (14) |
Incentive payment charges and other expenses related to frozen benefit plan |  | $ 44 |  | $ 45 |
[1] | During the second quarter of 2021, we made a decision to freeze our Defined Benefit Pension Scheme in the United Kingdom. As a result, we recognized a curtailment credit of $(14 million) for the three and six months ended June 30, 2021 recorded within benefit plan non-service income. We also incurred incentive payment charges and other expenses related to this decision of $44 million for the three months ended June 30, 2021 and $45 million for the six months ended June 30, 2021 included in operating income.
[2] | In connection with our Simplify to Grow Program, settlement losses and other expenses were $1 million for the three and six months ended June 30, 2021 and $4 million for the three and six months ended June 30, 2020. These losses were recorded within benefit plan non-service income.

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