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Postretirement Benefit Plans - Defined Contribution Plan (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Benefits [Abstract] |  |  |
Contributions made to defined contribution plans | $ 613 | $ 617 | $ 393
Shares of our stock held in defined contribution plans we sponsor | 35.5 | 36.9 |

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- Definition Shares of our stock held in defined contribution plans we sponsor. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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