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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Non-service related postretirement costs |  | $ 87 | $ 118 | $ 118 |
Accounting Standards Update 2018-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Tax reform, reclassification from AOCI to retained earnings, tax effect | $ 163 |  |  |  |
Reclassifying Adjustment | Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Non-service related postretirement costs |  |  | $ 118 | $ 118 |
Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease, right-of-use assets |  |  |  |  | $ 450
Operating lease, liabilities |  |  |  |  | $ 575

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- Definition Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 + Details
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