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Changes in Other Comprehensive Income (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | $ (8) | $ (12) | $ 174 | $ (92) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (9) | (25) | (144) | (47) |  |  |  |
Total other comprehensive income (loss) |  | (16) | (37) | 30 | (139) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  | 237 | 131 | 237 | 131 | $ 254 | $ 207 | $ 168 | $ 270
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  | 5 | (6) | 53 | (178) |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | (3) | (5) | (134) | (9) |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 2 | (11) | (81) | (187) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax |  | 136 | (46) | 136 | (46) | 134 | 218 | (35) | 142
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax |  | (12) | (6) | 121 | 86 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | (6) | (20) | (10) | (37) |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | (18) | (26) | 111 | 48 |  |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  | 146 | 222 | 146 | 222 | 165 | 36 | 248 | 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) | $ (45) | $ (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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