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Financial Instruments - Short-Term Borrowings (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 24, 2016
--- | --- | --- | ---
Short-term Debt [Line Items] |  |  |  |
Commercial paper |  | $ 3,100,000,000 | $ 6,100,000,000 |
Current portion of long-term debt, principal amount | [1] | 4,781,000,000 | 3,532,000,000 |
Other short-term borrowings | [2] | 966,000,000 | 320,000,000 |
Total short-term borrowings, principal amount |  | 8,847,000,000 | 9,951,000,000 |
Net fair value adjustments related to hedging and purchase accounting |  | (5,000,000) | 14,000,000 |
Net unamortized discounts, premiums and debt issuance costs |  | (11,000,000) | (12,000,000) |
Total Short-term borrowings, including current portion of long-term debt, carried at historical proceeds, as adjusted | [3] | $ 8,831,000,000 | $ 9,953,000,000 |
Commercial Paper [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Commercial paper, weighted average interest rate |  | 2.42% | 1.36% |
Anacor [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Debt assumed |  |  |  | $ 698,000,000
Line of Credit [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 552,539,000 |  |
Line of credit facility, due to expire within one year |  | 502,000,000 |  |
Line of Credit [Member] | Commercial Paper [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 7,000,000,000 |  |
Line of credit facility, remaining borrowing capacity |  | $ 7,500,000,000 |  |
[1] | For additional information, see Note 7D.
[2] | Other short-term borrowings primarily include cash collateral. For additional information, see Note 7F.
[3] | Amounts may not add due to rounding.

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