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Long-term Employee Benefits (Schedule of Net Periodic Pension Income and Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net periodic pension cost (income): |  |  |  |
Net periodic pension cost (income) | $ 380 | $ 381 | $ (18) | $ (22)
Changes in plan assets and benefit obligations recognized in other comprehensive income: |  |  |  |
Net loss (gain) |  | 144 | 115 | (24)
Amortization of actuarial loss |  | (18) | (16) | (24)
Prior service gain |  | (5) | 0 | 0
Amortization of prior service gain |  | 2 | 2 | 2
Effect of foreign exchange rates |  | (7) | (8) | 38
(Benefit) cost recognized in other comprehensive income |  | (267) | 93 | (8)
Pension Plan [Member] | Foreign [Member] |  |  |  |
Net periodic pension cost (income): |  |  |  |
Service cost |  | 13 | 14 | 16
Interest cost |  | 17 | 16 | 16
Expected return on plan assets |  | (48) | (58) | (75)
Amortization of prior service gain |  | (2) | (2) | (2)
Amortization of actuarial loss |  | 18 | 12 | 22
Settlement loss |  | 383 |  | 1
Net periodic pension cost (income) |  | 381 | (18) | (22)
Changes in plan assets and benefit obligations recognized in other comprehensive income: |  |  |  |
Net loss (gain) |  | 144 | 115 | (24)
Amortization of actuarial loss |  | (18) | (16) | (24)
Prior service gain |  | (5) |  |
Amortization of prior service gain |  | 2 | 2 | 2
Settlement loss |  | (383) |  |
Effect of foreign exchange rates |  | (7) | (8) | 38
(Benefit) cost recognized in other comprehensive income |  | (267) | 93 | (8)
Total net periodic pension income and cost (benefit) recognized in other comprehensive income |  | $ 114 | $ 75 | $ (30)

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