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Retirement Plans (Schedule Of Changes In Defined Benefit Plan Obligations) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits [Member] |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 924 | $ 916 |
Service cost | 5 | 7 | $ 9
Interest cost | 25 | 32 | 38
Actuarial loss (gain) | 116 | 91 |
Plan amendments | 2 | 3 |
Plan curtailments | (14) | (3) |
Plan settlements | (28) | (75) |
Benefits paid | (49) | (47) |
Benefit obligation at end of year | 981 | 924 | 916
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 694 | 685 |
Actual return on plan assets | 114 | 118 |
Employer contributions | 14 | 13 |
Plan settlements | (28) | (75) |
Benefits paid | (49) | (47) |
Fair value of plan assets at end of year | 745 | 694 | 685
Funded status at end of year | (236) | (230) |
Amounts recognized in balance sheet: |  |  |
Other long-term assets | 10 |  |
Other current liabilities | (14) | (13) |
Other long-term liabilities | (232) | (217) |
Net amount | (236) | (230) |
Amounts recognized in accumulated other comprehensive earnings: |  |  |
Net actuarial loss (gain) | 201 | 183 |
Prior service cost (credit) |  | 5 |
Total | 201 | 188 |
Postretirement Benefits [Member] |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 14 | 17 |
Actuarial loss (gain) | (1) | (3) |
Plan curtailments | 1 | 1 |
Participant contributions | 2 | 2 |
Benefits paid | (3) | (3) |
Benefit obligation at end of year | 13 | 14 | $ 17
Change in plan assets: |  |  |
Employer contributions | 1 | 1 |
Participant contributions | 2 | 2 |
Benefits paid | (3) | (3) |
Funded status at end of year | (13) | (14) |
Amounts recognized in balance sheet: |  |  |
Other current liabilities | (2) |  |
Other current liabilities |  | (2) |
Other long-term liabilities | (11) |  |
Other long-term liabilities |  | (12) |
Net amount | (13) | (14) |
Amounts recognized in accumulated other comprehensive earnings: |  |  |
Net actuarial loss (gain) | (12) | (12) |
Prior service cost (credit) |  | (1) |
Total | $ (12) | $ (13) |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. 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 (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 contributions received by defined benefit plan from participant which increases plan assets. + 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 (b)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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 (b)(8) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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