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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020
Income Taxes |  |  |  |  |  |
Income Tax Expense (Benefit) | $ (203) | $ 59 | $ (613) | $ (364) |  |
Unrecognized tax benefits | 989 |  | 989 |  |  | $ 998
Unrecognized tax benefits that would impact effective tax rate | 745 |  | 745 |  |  | 753
Unrecognized tax benefits, interest and penalties accrued | $ 150 |  | $ 150 |  |  | 146
Effective Income Tax Rate Reconciliation, Percent | (47.60%) | 21.00% | 259.70% | 7.20% |  |
Deferred income taxes and other liabilities | $ 10,274 |  | $ 10,274 |  |  | 8,594
Net Operating Loss Carryback [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Income Tax Expense (Benefit) | (420) |  |  |  |  |
Deferred income taxes and other liabilities |  |  |  |  |  | 700
Income Taxes Receivable | 974 |  | 974 |  |  |
Minimum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Estimated range of decrease in unrecognized tax benefits within the next 12 months | 0 |  | 0 |  |  |
Maximum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Estimated range of decrease in unrecognized tax benefits within the next 12 months | $ 370 |  | 370 |  |  |
Internal Revenue Service (IRS) [Member] | Minimum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Open Tax Year | 2008 |  |  |  |  |
Patient Recovery Business |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Indemnification Receivable | $ 19 |  | 19 |  |  | 19
CareFusion [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Indemnification Receivable | 181 |  | 181 |  |  | 176
Total Opioid Litigation [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Estimated Litigation Liability | 6,590 |  | 6,590 |  |  |
Income Tax Expense (Benefit) | $ 150 |  | (300) |  |  | (488)
Unrecognized tax benefits that would impact effective tax rate |  |  |  |  |  | $ 469
Litigation Settlement, Expense |  |  | $ 1,020 | $ 5,630 |  |
Total Opioid Litigation [Member] | Forecast [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | $ (35) |
Unrecognized tax benefits that would impact effective tax rate |  |  |  |  | $ 34 |

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