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Financial Instruments - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) interest_rate_swap | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) interest_rate_swap | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 31, 2021 USD ($) interest_rate_swap
Derivative [Line Items] |  |  |  |  |  |
Notional amount of derivative | $ 32,958,000,000 | $ 32,784,000,000 | $ 32,958,000,000 | $ 32,784,000,000 |  |
Face amount of debt | 8,000,000,000 |  | 8,000,000,000 |  |  |
Pre tax net unrealized gain on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales |  |  | 170,000,000 |  |  |
Equity investments without readily determinable fair values | 596,000,000 | 586,000,000 | 596,000,000 | 586,000,000 |  |
Unrealized gains recognized on investments in equity securities without readily determinable fair value |  |  | 110,000,000 | 62,000,000 |  |
Unrealized losses recognized on investments in equity securities without readily determinable fair values |  |  | 1,000,000 | 3,000,000 |  |
Cumulative upward price adjustment | 234,000,000 |  | 234,000,000 |  |  |
Cumulative downward price adjustment | 7,000,000 |  | 7,000,000 |  |  |
Fair value of loans payable and long-term debt, including current portion | 35,700,000,000 | 36,000,000,000 | 35,700,000,000 | 36,000,000,000 |  |
Debt, carrying amount | 33,100,000,000 | 31,800,000,000 | 33,100,000,000 | 31,800,000,000 |  |
Factored accounts receivable | 2,800,000,000 | 2,100,000,000 |  |  |  |
Funds collected from factoring of receivable, held in restricted cash | 62,000,000 | 102,000,000 | 62,000,000 | 102,000,000 |  |
Cash collateral received from counterparties | 164,000,000 | 0 | 164,000,000 | 0 |  |
Cash collateral advanced to counterparties | 0 | 36,000,000 | 0 | 36,000,000 |  |
Equity securities held through ownership interests in investment funds | 1,700,000,000 | 800,000,000 | 1,700,000,000 | 800,000,000 |  |
(Gains) losses for equity securities held through ownership interests in investment funds |  |  | $ (1,400,000,000) | (583,000,000) | $ 113,000,000 |
3.875% Notes Due 2021 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 1,150,000,000
Stated interest rate |  |  |  |  |  | 3.875%
Customer Concentration Risk | Accounts Receivable | McKesson |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Percentage of accounts receivable represented by customers with largest balances (as percent) |  |  | 20.00% |  |  |
Customer Concentration Risk | Accounts Receivable | AmerisourceBergen Corporation |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Percentage of accounts receivable represented by customers with largest balances (as percent) |  |  | 15.00% |  |  |
Customer Concentration Risk | Accounts Receivable | Cardinal Health, Inc. |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Percentage of accounts receivable represented by customers with largest balances (as percent) |  |  | 10.00% |  |  |
Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash equivalents | $ 6,800,000,000 | 6,800,000,000 | $ 6,800,000,000 | 6,800,000,000 |  |
Interest Rate Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of interest rate swaps held | interest_rate_swap | 9 |  | 9 |  |  | 5
Notional amount of derivative |  |  |  |  |  | $ 1,150,000,000
Derivatives Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount of derivative | $ 12,245,000,000 | 13,714,000,000 | $ 12,245,000,000 | 13,714,000,000 |  |
Derivatives Not Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount of derivative | $ 20,713,000,000 | $ 19,070,000,000 | $ 20,713,000,000 | $ 19,070,000,000 |  |
Maximum | Derivatives Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Maximum planning cycle of hedges (less than) |  |  | 2 years |  |  |
Maximum | Derivatives Not Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Maximum planning cycle of hedges (less than) |  |  | 1 year |  |  |

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