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Accumulated Other Comprehensive Income (Loss) (Schedule Of Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]      
Foreign currency translation adjustments, Pre-Tax $ 148 $ (529) $ 717
Foreign currency translation adjustments, Tax (Credit) (3) 0 2
Foreign currency translation adjustments, Net of Tax 151 (529) 715
Unrealized investment gains, Pre-Tax 0 0 (7)
Unrealized investment gains, Tax (Credit)     (2)
Unrealized investment gains, Net of Tax     (5)
Pension/post-retirement plans:      
Amortization of prior service credits, Pre-Tax (2) (4) (1)
Amortization of prior service credits, Tax (Credit) (1) (1) 0
Amortization of prior service credits, Net of Tax (1) (3) (1)
Amortization of net actuarial losses, Pre-Tax 102 145 167
Amortization of net actuarial losses, Tax (Credit) 22 32 30
Amortization of net actuarial losses, Net of Tax 80 113 137
Amortization of effect of curtailment, Pre-Tax 0   (1)
Amortization of effect of curtailment, Tax (Credit) 0   0
Amortization of effect of curtailment, Net of Tax 0   (1)
Amortization of effect of settlement, Pre-Tax 6 42 54
Amortization of effect of settlement, Tax (Credit) 1 8 9
Amortization of effect of settlement, Net of Tax 5 34 45
Amortization of effect of remeasurement, Pre-Tax 0    
Amortization of effect of remeasurement, Tax (Credit) 0    
Amortization of effect of remeasurement, Net of Tax 0    
Amortization of Plan Termination, Pre-Tax 0    
Amortization of Plan Termination, Tax 0    
Amortization of Plan Termination, Net of Tax 0    
Subtotal, Pre-Tax 106 183 219
Subtotal, Tax (Credit) 22 39 39
Subtotal, Net of Tax 84 144 180
Net (losses) gains arising during period, Pre-Tax (758) (374) 374
Net (losses) gains arising during period, Tax (Credit) (154) (88) 62
Net (losses) gains arising during period, Net of Tax (604) (286) 312
Foreign currency translation adjustments, Pre-Tax (50) 141 (201)
Foreign currency translation adjustments, Tax (Credit) (11) 25 (36)
Foreign currency translation adjustments, Net of Tax (39) 116 (165)
Other adjustments. Pre-Tax   (41) 16
Other adjustments, Tax (Credit)   (6) 3
Other adjustments, Net of Tax   (35) 13
Pension/post-retirement plans (losses) gains, Pre-Tax (702) (91) 408
Pension/post-retirement plans (losses) gains, Tax (Credit) (143) (30) 68
Pension/post-retirement plans (losses) gains, Net of Tax (559) (61) 340
Other comprehensive (loss) income, before tax (554) (620) 1,118
Other comprehensive (loss) income, Tax (Credit) (146) (30) 68
Other comprehensive (loss) income, net of tax $ (408) $ (590) $ 1,050