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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Benefit) and Other Amounts Recognized in Other Comprehensive Income (Loss), Additional Information (Details) - USD ($) |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Employer contributions |  |  |  | $ 101,000,000 |
Reduction in interest cost component of net periodic interest |  |  |  |  | $ 32
Pension Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Pre-tax settlement charge |  |  |  | 0 | 750,000,000
After-tax settlement charge | $ 750,000,000 |  |  |  | 488,000,000
Reduction to stockholder's equity |  |  |  |  | 144,000,000
Employer contributions |  |  |  | 103,000,000 | 280,000,000
Increase to unrecognized net loss from pension settlement transaction |  |  |  |  | $ 750,000,000
Pension Benefits | Qualified Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Employer contributions |  | $ 280,000,000 |  |  |
Discount rate used to measure interest cost |  |  | 3.37% |  | 3.58%
Discount rate used to measure interest cost, historical method |  |  | 3.92% |  | 4.22%
Pension Benefits | Non-Qualified Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Discount rate used to measure interest cost |  |  |  |  | 3.55%
Discount rate used to measure interest cost, historical method |  |  | 4.19% |  |
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Pre-tax settlement charge |  |  |  |  | $ 0
Employer contributions |  |  |  | $ 0 | $ 0
Discount rate used to measure interest cost |  |  |  |  | 3.13%
Discount rate used to measure interest cost, historical method |  |  |  |  | 3.97%

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- Definition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Under Historical Estimation Methods, Interest Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Interest Cost, Assumption Change + References No definition available. + Details
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- Definition Defined Benefit Plans, Increase (Decrease) in Stockholder's Equity + References No definition available. + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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