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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Oil and gas properties, net - full cost method: |  |
Accumulated amortization | $ 27,433 | $ 22,276
Stockholders’ equity: |  |
Common stock, par value (in dollars per share) | $ 0.10 | $ 0.10
Common stock, shares issued (in shares) | 1,574 | 1,374
Common stock hold in treasury (in shares) | 129 | 128

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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