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Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | $ 48 | $ 275 | $ (37) | $ (491)
Other comprehensive income (loss), tax | 4 | 10 | 6 | 36
Other comprehensive income (loss), net of tax | 44 | 265 | (43) | (527)
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, before tax | 24 | 241 | (67) | (700)
Other comprehensive income (loss), before reclassification, tax | 0 | 4 | 0 | (7)
Other comprehensive income (loss), before reclassification, net of tax | 24 | 237 | (67) | (693)
Reclassification from AOCI, net of tax | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 24 | 237 | (67) | (693)
Pension/Post-Retirement Plans Gains (Losses) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, net of tax | (16) | (3) | (52) | 106
Reclassification from AOCI, before Tax | 51 | 39 | 103 | 79
Reclassification from AOCI, tax | 15 | 8 | 27 | 19
Reclassification from AOCI, net of tax | 36 | 31 | 76 | 60
Other comprehensive income (loss), before tax | 24 | 34 | 30 | 209
Other comprehensive income (loss), tax | 4 | 6 | 6 | 43
Other comprehensive income (loss), net of tax | 20 | 28 | 24 | 166
Prior service credits |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, before Tax | (1) | (1) | (1) | (1)
Reclassification from AOCI, tax | 0 | 0 | 0 | 0
Reclassification from AOCI, net of tax | (1) | (1) | (1) | (1)
Net actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, before Tax | 52 | 40 | 104 | 80
Reclassification from AOCI, tax | 15 | 8 | 27 | 19
Reclassification from AOCI, net of tax | 37 | 32 | 77 | 61
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, before tax | (44) | (5) | (81) | 130
Other comprehensive income (loss), before reclassification, tax | (12) | (2) | (20) | 24
Other comprehensive income (loss), before reclassification, net of tax | (32) | (3) | (61) | 106
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 | 15 | 0 | 13 | 0
Other comprehensive income (loss), before reclassification, tax | 1 | 0 | 1 | 0
Other comprehensive income (loss), before reclassification, net of tax | 14 | 0 | 12 | 0
Effect of settlement |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassification, before tax | 2 | 0 | 2 | 0
Other comprehensive income (loss), before reclassification, tax | 0 | 0 | 0 | 0
Other comprehensive income (loss), before reclassification, net of tax | $ 2 | $ 0 | $ 2 | $ 0

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