Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax		$ (237)	$ 127	$ (538)	$ 652
Foreign currency translation adjustments, Tax		5	1	(3)	2
Foreign currency translation adjustments, Net of Tax		(242)	126	(535)	650
Unrealized investment gains (losses), Pre-Tax		0	(8)	0	11
Unrealized investment gains (losses), Tax		0	(3)	0	5
Unrealized investment gains (losses), Net of Tax		0	(5)	0	6
Pension/post-retirement plans:
Prior services credits, Pre-Tax	[1]	(1)	0	(3)	0
Prior service credits, Tax	[1]	(1)	0	(1)	0
Prior service credits, Net of Tax	[1]	0	0	(2)	0
Net actuarial loss, Pre-Tax	[1]	36	43	110	125
Net actuarial loss, Tax	[1]	7	10	23	29
Net actuarial loss, Net of Tax	[1]	29	33	87	96
Subtotal, Pre-Tax		35	43	107	125
Subtotal, Tax		6	10	22	29
Subtotal, Net of Tax		29	33	85	96
Effect of remeasurement, Pre-tax		3	3	3	12
Effect of remeasurement, Tax		0	0	0	3
Effect of remeasurement, Net of Tax		3	3	3	9
Effect of curtailment, Pre-Tax				0	(1)
Effect of curtailment, Tax				0	0
Effect of curtailment, Net of Tax				0	(1)
Effect of settlement, Pre-tax		0	1	0	2
Effect of settlement, Tax		0	0	0	0
Effect of settlement, Net of Tax		0	1	0	2
Foreign currency translation adjustment, Pre-Tax		(15)	(215)	21	(277)
Foreign currency translation adjustment, Tax		(2)	(38)	5	(49)
Foreign currency translation adjustment, Net of Tax		(13)	(177)	16	(228)
Other, Pre-Tax				0	(1)
Other, Tax				0	0
Other, Net of Tax				0	(1)
Pension/post-retirement plans (losses) gains, Pre-Tax		23	(168)	131	(140)
Pension/post-retirement plans (losses) gains, Tax		4	(28)	27	(17)
Pension/post-retirement plans (losses) gains, Net of Tax		19	(140)	104	(123)
Other comprehensive (loss) income, before tax		(214)	(49)	(407)	523
Other comprehensive income (loss), Tax		9	(30)	24	(10)
Other comprehensive (loss) income, net of tax		$ (223)	$ (19)	$ (431)	$ 533

[1] Components of net periodic pension cost are included in compensation and benefits in the Consolidated Statements of Income. Tax on prior service gains and net actuarial losses is included in income tax expense.