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Employee Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | $ 22 | $ 21 | $ 30
Actuarial loss (gain) | 5 | 2 |
Defined Benefit Plan, Effect of Decrease of Rate of Return on Plan Assets on Service and Interest Cost Components | 2 |  |
Payment for Pension Benefits | 0 | 62 |
OtherPostretirementDefinedBenefitPlanLiabilityCurrent | 2 | 2 |
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components | $ 3 |  |
Company match pre 2009 hire | 6.00% |  |
Company match post 2008 hire | 5.00% |  |
Company contribution percentage to 401k for post 2008 hires | 5.00% |  |
Company contribution percent to 401k for bargaining employees | 1.00% |  |
401k Plan Company contributions | $ 26 | 25 | 23
Actuarial loss (gain) | 5 | 2 |
Other Postretirement Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 2 | $ 0
Actuarial loss (gain) | 4 | 8 |
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) | 4 | 6 |
Actuarial loss (gain) | 4 | 8 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial loss (gain) | 104 | 88 |
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) | 44 | 42 |
Actuarial loss (gain) | 104 | 88 |
Other Pension, Postretirement and Supplemental Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial loss (gain) | 3 | 3 |
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) | 2 | 2 |
Actuarial loss (gain) | $ 3 | $ 3 |

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- Definition For bargaining employees, who are subject to the International Brotherhood of Electrical Workers Local 125 agreements, the Company contributes a stated amount per compensable hour plus this percentage of the employee’s base salary, whether or not the employee contributes to the 401k Plan. + References No definition available. + Details
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- Definition Company contribution percentage of participating employee's base salary for employees hired post January 31, 2009, regardless of whether the employee contributes to the 401k plan. + References No definition available. + Details
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- Definition Company match, percentage of participating employee's base salary for employees hired post January 31, 2009. + References No definition available. + Details
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- Definition Company match, percentage of participating employee's base salary for employees hired pre February 1, 2009. + References No definition available. + Details
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- Definition Defined Benefit Plan, Effect of Decrease of Rate of Return on Plan Assets on Service and Interest Cost Components + References No definition available. + Details
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- Definition This represents the current liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans). + References No definition available. + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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