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Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | $ (142) | $ 427 | $ (179) | $ (64)
Other comprehensive income (loss), tax | 50 | (7) | 56 | 29
Other comprehensive (loss) income, net of tax | (192) | 434 | (235) | (93)
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, before tax | (346) | 500 | (413) | (200)
Other comprehensive income (loss), before reclassification, tax | 0 | 3 | 0 | (4)
Other comprehensive income (loss), before reclassification, net of tax | (346) | 497 | (413) | (196)
Reclassification from AOCI, net of tax | 0 | 0 | 0 | 0
Other comprehensive (loss) income, net of tax | (346) | 497 | (413) | (196)
Pension/Post-Retirement Plans Gains (Losses) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, net of tax | 115 | (94) | 63 | 12
Reclassification from AOCI, before Tax | 52 | 40 | 155 | 119
Reclassification from AOCI, tax | 13 | 9 | 40 | 28
Reclassification from AOCI, net of tax | 39 | 31 | 115 | 91
Other comprehensive income (loss), before tax | 204 | (73) | 234 | 136
Other comprehensive income (loss), tax | 50 | (10) | 56 | 33
Other comprehensive (loss) income, net of tax | 154 | (63) | 178 | 103
Prior service credits |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, before Tax |  |  | (1) | (1)
Reclassification from AOCI, tax |  |  | 0 | 0
Reclassification from AOCI, net of tax |  |  | (1) | (1)
Net actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, before Tax | 52 | 40 | 156 | 120
Reclassification from AOCI, tax | 13 | 9 | 40 | 28
Reclassification from AOCI, net of tax | 39 | 31 | 116 | 92
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, before tax | 88 | (113) | 7 | 17
Other comprehensive income (loss), before reclassification, tax | 21 | (19) | 1 | 5
Other comprehensive income (loss), before reclassification, net of tax | 67 | (94) | 6 | 12
Other adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, before tax |  |  | (7) | 0
Other comprehensive income (loss), before reclassification, tax |  |  | (2) | 0
Other comprehensive income (loss), before reclassification, net of tax |  |  | (5) | 0
Effect of remeasurement |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, before tax | 64 | 0 | 77 | 0
Other comprehensive income (loss), before reclassification, tax | 16 | 0 | 17 | 0
Other comprehensive income (loss), before reclassification, net of tax | $ 48 | $ 0 | 60 | 0
Effect of settlement |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, before tax |  |  | 2 | 0
Other comprehensive income (loss), before reclassification, tax |  |  | 0 | 0
Other comprehensive income (loss), before reclassification, net of tax |  |  | $ 2 | $ 0

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