Accumulated Other Comprehensive Income (Loss) (Schedule Of Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax	$ 559	$ 148	$ (529)
Foreign currency translation adjustments, Tax (Credit)	0	(3)	0
Foreign currency translation adjustments, Net of Tax	559	151	(529)
Pension/post-retirement plans:
Amortization of prior service credits, Pre-Tax	(2)	(2)	(4)
Amortization of prior service credits, Tax (Credit)	(1)	(1)	(1)
Amortization of prior service credits, Net of Tax	(1)	(1)	(3)
Amortization of net actuarial losses, Pre-Tax	161	102	145
Amortization of net actuarial losses, Tax (Credit)	37	22	32
Amortization of net actuarial losses, Net of Tax	124	80	113
Amortization of effect of settlement, Pre-Tax	3	6	42
Amortization of effect of settlement, Tax (Credit)	1	1	8
Amortization of effect of settlement, Net of Tax	2	5	34
Subtotal, Pre-Tax	162	106	183
Subtotal, Tax (Credit)	37	22	39
Subtotal, Net of Tax	125	84	144
Net (losses) gains arising during period, Pre-Tax	(772)	(758)	(374)
Net (losses) gains arising during period, Tax (Credit)	(177)	(154)	(88)
Net (losses) gains arising during period, Net of Tax	(595)	(604)	(286)
Foreign currency translation adjustments, Pre-Tax	(163)	(50)	141
Foreign currency translation adjustments, Tax (Credit)	(28)	(11)	25
Foreign currency translation adjustments, Net of Tax	(135)	(39)	116
Other adjustments. Pre-Tax	(11)		(41)
Other adjustments, Tax (Credit)	(2)		(6)
Other adjustments, Net of Tax	(9)		(35)
Pension/post-retirement plans (losses) gains, Pre-Tax	(784)	(702)	(91)
Pension/post-retirement plans (losses) gains, Tax (Credit)	(170)	(143)	(30)
Pension/post-retirement plans (losses) gains, Net of Tax	(614)	(559)	(61)
Other comprehensive loss, before tax	(225)	(554)	(620)
Other comprehensive (loss) income, Tax (Credit)	(170)	(146)	(30)
Other comprehensive loss, net of tax	$ (55)	$ (408)	$ (590)