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Derivative Instruments (Forward Currency Exchange Contracts) (Details) - Foreign currency exchange forward contracts $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 EUR (€) | Jul. 31, 2019 USD ($) | Nov. 30, 2018 EUR (€)
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 8,088 | $ 6,336 |  |  |
Maximum term | 1646 days | 586 days |  |  |
Derivative, fair value, net | $ 203 | $ 57 |  |  |
Other current assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset | 185 | 43 |  |  |
Other noncurrent assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset | 41 | 34 |  |  |
Other current liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | (21) | (20) |  |  |
Other noncurrent liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | (2) | 0 |  |  |
Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 1,113 | 0 | € 2,400,000,000 | $ 1,000 | € 2,250,000,000
Derivative, fair value, net | 40 | 0 |  |  |
Designated as Hedging Instrument | Other current assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset | 0 | 0 |  |  |
Designated as Hedging Instrument | Other noncurrent assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset | 40 | 0 |  |  |
Designated as Hedging Instrument | Other current liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | 0 | 0 |  |  |
Designated as Hedging Instrument | Other noncurrent liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | 0 | 0 |  |  |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 6,174 | 5,466 |  |  |
Derivative, fair value, net | 169 | 46 |  |  |
Not Designated as Hedging Instrument | Other current assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset | 180 | 28 |  |  |
Not Designated as Hedging Instrument | Other noncurrent assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset | 0 | 33 |  |  |
Not Designated as Hedging Instrument | Other current liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | (11) | (15) |  |  |
Not Designated as Hedging Instrument | Other noncurrent liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | 0 | 0 |  |  |
Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 801 | 870 |  |  |
Derivative, fair value, net | (6) | 11 |  |  |
Cash Flow Hedging | Designated as Hedging Instrument | Other current assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset | 5 | 15 |  |  |
Cash Flow Hedging | Designated as Hedging Instrument | Other noncurrent assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset | 1 | 1 |  |  |
Cash Flow Hedging | Designated as Hedging Instrument | Other current liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | (10) | (5) |  |  |
Cash Flow Hedging | Designated as Hedging Instrument | Other noncurrent liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | $ (2) | $ 0 |  |  |

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- Definition Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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