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Changes in Other Comprehensive Income (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | $ 14 | $ 38 | $ 188 | $ (54) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (13) | (19) | (157) | (65) |  |  |  |
Total other comprehensive income (loss) |  | 1 | 20 | 31 | (119) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  | 238 | 151 | 238 | 151 | $ 237 | $ 207 | $ 131 | $ 270
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  | (47) | 88 | 5 | (90) |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | (2) | (5) | (135) | (14) |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | (49) | 84 | (130) | (104) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax |  | 88 | 38 | 88 | 38 | 136 | 218 | (46) | 142
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax |  | 61 | (50) | 182 | 36 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | (11) | (14) | (21) | (52) |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | 50 | (64) | 161 | (15) |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  | 196 | 158 | 196 | 158 | 146 | 36 | 222 | 173
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax |  | 0 | 0 | 1 | 0 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax |  | 0 | 0 | 0 | 0 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 0 | 0 | 1 | 0 |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  | $ (46) | $ (45) | $ (46) | $ (45) | $ (46) | $ (47) | $ (45) | $ (45)
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Specialty Pharmaceuticals [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax | $ (127) |  |  |  |  |  |  |  |

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