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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]      
Foreign currency translation adjustments, Pre-Tax $ (529) $ 717 $ (742)
Foreign currency translation adjustments, Tax (Credit) 0 2 36
Foreign currency translation adjustments, Net of Tax (529) 715 (778)
Unrealized investment gains (losses), Pre-Tax 0 (7) 21
Unrealized investment gains (losses), Tax (Credit)   (2) 8
Unrealized investment gains (losses), Net of Tax   (5) 13
Pension/post-retirement plans:      
Amortization of prior service credits, Pre-Tax (4) (1) 3
Amortization of prior service credits, Tax (Credit) (1) 0 1
Amortization of prior service credits, Net of Tax (3) (1) 2
Net actuarial losses, Pre-Tax 145 167 166
Net actuarial losses, Tax (Credit) 32 30 46
Net actuarial losses, Net of Tax 113 137 120
Losses included in periodic pension cost, Pre-Tax 183 219 169
Losses including in periodic pension cost, Tax (Credit) 39 39 47
Losses including in periodic pension cost, Net of Tax 144 180 122
Curtailment gain, Pre-Tax   (1) 102
Curtailment gain, Tax (Credit)   0 38
Curtailment gain, Net of Tax   (1) 64
Effect of Settlement, Pre-Tax 42 54  
Effect of Settlement, Tax (Credit) 8 9  
Effect of Settlement, Net of Tax 34 45  
Net gain (loss) arising during period, Pre-Tax (374) 374 (855)
Net gain (loss) arising during period, Tax (Credit) (88) 62 (175)
Net gain (loss) arising during period, Net of Tax (286) 312 (680)
Foreign currency translation adjustments, Pre-Tax 141 (201) 416
Foreign currency translation adjustments, Tax (Credit) 25 (36) 70
Foreign currency translation adjustments, Net of Tax 116 (165) 346
Other adjustments. Pre-Tax (41) 16 49
Other adjustments, Tax (Credit) (6) 3 9
Other adjustments, Net of Tax (35) 13 40
Pension/post-retirement plans gains (losses), Pre-Tax (91) 408 (119)
Pension/post-retirement plans gains (losses), Tax (Credit) (30) 68 (11)
Pension/post-retirement plans gains (losses), Net of Tax (61) 340 (108)
Other comprehensive (loss) income, before tax (620) 1,118 (840)
Other comprehensive income (loss), Tax (Credit) (30) 68 33
Other comprehensive (loss) income, net of tax $ (590) $ 1,050 $ (873)