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Other Comprehensive Income (Loss) (Schedule Of Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |  |  |
Foreign currency translation adjustments, Pre-Tax |  | $ 717 |  | $ (742) | $ (639)
Foreign currency translation adjustments, Tax (Credit) |  | 2 |  | 36 | 4
Foreign currency translation adjustments, Net of Tax |  | 715 |  | (778) | (643)
Unrealized investment gains (losses), Pre-Tax |  | (7) |  | 21 | 1
Unrealized investment gains (losses), Tax (Credit) |  | (2) |  | 8 | 0
Unrealized investment gains (losses), Net of Tax |  | (5) |  | 13 | 1
Pension/post-retirement plans: |  |  |  |  |
Amortization of prior service credits, Pre-Tax | [1] | (1) |  | 3 | (1)
Amortization of prior service credits, Tax (Credit) | [1] | 0 |  | 1 | 0
Amortization of prior service credits, Net of Tax | [1] | (1) |  | 2 | (1)
Net actuarial losses, Pre-Tax | [1] | 167 |  | 166 | 271
Net actuarial losses, Tax (Credit) | [1] | 30 |  | 46 | 96
Net actuarial losses, Net of Tax | [1] | 137 |  | 120 | 175
Losses included in periodic pension cost, Pre-Tax |  | 219 |  | 169 | 270
Losses including in periodic pension cost, Tax (Credit) |  | 39 |  | 47 | 96
Losses including in periodic pension cost, Net of Tax |  | 180 |  | 122 | 174
Curtailment gain, Pre-Tax |  | (1) | [1] | 102 | (3)
Curtailment gain, Tax (Credit) |  | 0 | [1] | 38 | 0
Curtailment gain, Net of Tax |  | (1) | [1] | 64 | (3)
Effect of Settlement, Pre-Tax | [1] | 54 |  |  |
Effect of Settlement, Tax (Credit) | [1] | 9 |  |  |
Effect of Settlement, Net of Tax | [1] | 45 |  |  |
Plan termination, Pre-Tax |  |  |  |  | (6)
Plan termination, Tax (Credit) |  |  |  |  | (3)
Plan termination, Net of Tax |  |  |  |  | (3)
Net gain (loss) arising during period, Pre-Tax |  | 374 |  | (855) | (125)
Net gain (loss) arising during period, Tax (Credit) |  | 62 |  | (175) | (62)
Net gain (loss) arising during period, Net of Tax |  | 312 |  | (680) | (63)
Foreign currency translation adjustments, Pre-Tax |  | (201) |  | 416 | 214
Foreign currency translation adjustments, Tax (Credit) |  | (36) |  | 70 | 43
Foreign currency translation adjustments, Net of Tax |  | (165) |  | 346 | 171
Other adjustments. Pre-Tax |  | 16 |  | 49 | (13)
Other adjustments, Tax (Credit) |  | 3 |  | 9 | (6)
Other adjustments, Net of Tax |  | 13 |  | 40 | (7)
Pension/post-retirement plans gains (losses), Pre-Tax |  | 408 |  | (119) | 337
Pension/post-retirement plans gains (losses), Tax (Credit) |  | 68 |  | (11) | 68
Pension/post-retirement plans gains (losses), Net of Tax |  | 340 |  | (108) | 269
Other comprehensive income (loss), before tax |  | 1,118 |  | (840) | (301)
Other comprehensive income (loss), Tax (Credit) |  | 68 |  | 33 | 72
Other comprehensive income (loss), net of tax |  | $ 1,050 |  | $ (873) | $ (373)
[1] | (a) Components of net periodic pension cost are included in other net benefit credits in the Consolidated Statements of Income. Tax on prior service gains and net actuarial losses is included in income tax expense.

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