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Employee Benefit Plans - Obligations and Funded Status, Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 3.30% | 3.30% | 3.30%
Fair value of plan assets had fair value of rabbi trusts been included | $ 4,549 | $ 4,075 |
Funded status of plan had fair value of rabbi trust assets been included | $ 326 | $ (423) |
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 2.65% | 3.33% |
Defined Benefit Plan, Benefit Obligation | $ 4,875 | $ 4,498 | $ 4,000
Assets held in rabbi trusts and designated for the non-qualified pension plans | 186 | 161 |
Cash Balance Pension Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | 443 | 420 |
Change in Assumptions for Defined Benefit Plans [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) | $ 434 | $ 508 |
Discount rate | 2.65% | 3.33% | 4.35%

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- Definition Assets held in rabbi trusts and designated for non qualified pension plans. + References No definition available. + Details
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- Definition Fair value of pension plan assets under rabbi trust. + References No definition available. + Details
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- Definition Funded status of pension benefits including fair value of pension plan assets under rabbi trust. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit 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) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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