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Contingencies and Environmental Liabilities Contingencies and Environmental Liabilities - Patent Litigation - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended | 84 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) | Feb. 28, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) patent | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2026 | Dec. 31, 2023
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Litigation settlement |  | $ (80) |  |  | $ 0 | $ (625) | $ 0 |  |
Number of Patents Involved in Legal Dispute | patent |  |  |  |  | 2 |  |  |  |
Percentage of settlement to be paid to third-party (as percent) |  |  |  |  | 20.00% |  |  |  |
Litigation Settlement, Amount Awarded from Other Party |  |  | $ 2,540 | $ 200 |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Royalty rate (as percent) |  |  |  |  |  |  |  | 2.50% | 6.50%
Patent litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  | $ 117 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Litigation settlement | $ 115 |  |  |  |  |  |  |  |

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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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