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Income Taxes - Schedule of Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Pension Plans | $ 79 | $ 41
Other Employee Benefit Plans | 146 | 182
Other | 529 | 657
Total | 754 | 880
Liabilities |  |
Accelerated Depreciation | 6,799 | 6,576
Other | 645 | 722
Total | 7,444 | 7,298
Net Deferred Income Tax Liabilities | $ 6,690 | $ 6,418

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