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Summary of Significant Accounting Policies - Prospective Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Item Effected [Line Items] |  |  |
Other Net Periodic Benefit Credit | $ 215 | $ 201 | $ 233

X
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X
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