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Derivatives (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Values of Derivative Financial Instruments | The following table summarizes the fair values and the presentation of our derivative financial instruments (defined and discussed individually below) in the consolidated balance sheets:
|  |  | December 31,
| Balance Sheet Location |  | 2018 |  | 2017
|  |  | (In millions)
Derivative asset: |  |  |  |  |
1.125% Call Option | Current assets: Derivative asset |  | $ | 476 |  |  | $ | 522 |
Derivative liability: |  |  |  |  |
1.125% Conversion Option | Current liabilities: Derivative liability |  | $ | 476 |  |  | $ | 522 |

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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