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Financial Instruments - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) interest_rate_swap | Mar. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) interest_rate_swap | Jun. 30, 2020 USD ($) | Jan. 31, 2021 USD ($) interest_rate_swap | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Pretax net unrealized losses on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales |  |  | $ 52,000,000 |  |  |
Equity investments without readily determinable fair values | $ 694,000,000 |  | 694,000,000 | $ 487,000,000 |  |
Unrealized gains recognized on investments in equity securities without readily determinable fair value |  |  | 75,000,000 | 18,000,000 |  |
Cumulative unrealized gains on investments | 244,000,000 |  | 244,000,000 |  |  |
Cumulative unrealized losses on investments | 8,000,000 |  | 8,000,000 |  |  |
Payments of contingent consideration |  |  | 0 | 106,000,000 |  |
Fair value of loans payable and long-term debt, including current portion | 29,500,000,000 |  | 29,500,000,000 |  |  | $ 36,000,000,000.0
Debt, carrying amount | 26,500,000,000 |  | 26,500,000,000 |  |  | 31,800,000,000
Accounts Receivable, Sale | 2,400,000,000 | $ 2,100,000,000 |  |  |  |
Cash collateral received from counterparties | 13,000,000 |  | 13,000,000 |  |  | 0
Cash collateral advanced to counterparties | 0 |  | 0 |  |  | 36,000,000
Total swap notional amount | 29,426,000,000 |  | 29,426,000,000 |  |  | 32,784,000,000
Unrealized losses recognized on investments in equity securities without readily determinable fair values |  |  | 1,000,000 | $ 3,000,000 |  |
Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash equivalents | 7,500,000,000 |  | 7,500,000,000 |  |  | 6,800,000,000
Derivatives Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Total swap notional amount | 12,755,000,000 |  | $ 12,755,000,000 |  |  | 13,714,000,000
Derivatives Designated as Hedging Instruments | Maximum |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Maximum average period of maturities of contracts in years (less than) |  |  | 2 years |  |  |
Derivatives Not Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Total swap notional amount | $ 16,671,000,000 |  | $ 16,671,000,000 |  |  | $ 19,070,000,000
Derivatives Not Designated as Hedging Instruments | Maximum |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Maximum average period of maturities of contracts in years (less than) |  |  | 1 year |  |  |
3.875% Notes Due 2021 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 1,150,000,000 |
Stated interest rate (as percent) |  |  |  |  | 3.875% |
Interest rate swap contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap | 9 |  | 9 |  | 5 |
Total swap notional amount |  |  |  |  | $ 1,150,000,000 |

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