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Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
ASU 2016-01 Recognition and Measurement of Financial Assets and Financial Liabilities | Maximum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Approximate equity securities and cost method investments in aggregate |  | $ 75,000,000 |  |
ASU 2017-07 Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Amount of net periodic benefit costs (benefits) that will no longer be included within operating expenses once ASU No. 2017-07 is adopted. |  | $ (128,000,000) | $ (196,000,000) | $ 34,000,000
Change | ASU 2017-07 Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |
Impact on previously reported consolidated income before income taxes | $ 0 |  |  |
Impact on previously reported net income | $ 0 |  |  |

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- Definition This amount represents the components of net periodic benefit costs (benefits) (such as interest, expected return on plan assets, prior service cost amortization and actuarial gain/loss) that no longer will be included within operating expense after adoption of ASU No. 2017-07. + References No definition available. + Details
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