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Financial Instruments - Narrative (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) interest_rate_swap | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Derivative [Line Items] |  |  |  |
Pretax losses from euro-denominated notes included in cumulative translation adjustments | $ 339 | $ 29 |  |
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap | 26 |  |  |
Pretax net unrealized loss on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales | $ 50 |  |  |
Available-for-sale debt securities included in Short-term investments | 4,200 |  |  |
Available-for-sale debt securities maturing after one year through five years | 10,800 |  |  |
Cash and cash equivalents | 7,786 | $ 6,608 | $ 6,515 | $ 8,524
Fair value of loans payable and long-term debt, including current portion | 26,000 |  | 25,700 |
Carrying value of loans payable and long-term debt, including current portion | 24,900 |  | 24,800 |
Accounts receivable outstanding for more than one year | 160 |  |  |
Cash collateral received from counterparties | 65 |  | $ 529 |
Significant Other Observable Inputs (Level 2) |  |  |  |
Derivative [Line Items] |  |  |  |
Cash and cash equivalents | 7,800 |  |  |
Cash equivalents | $ 6,700 |  |  |
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 | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Maximum average period of maturities of contracts in years (less than) | 1 year |  |  |

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