Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax		$ 228	$ 235
Foreign currency translation adjustments, Tax		5	0
Foreign currency translation adjustments, Net of Tax		223	235
Unrealized investment gains (losses), Pre-Tax		0	(5)
Unrealized investment gains (losses), Tax		0	(2)
Unrealized investment gains (losses), Net of Tax		0	(3)
Pension/post-retirement plans:
Prior services credits, Pre-Tax	[1]	(1)	0
Prior service credits, Tax	[1]	0	0
Prior service credits, Net of Tax	[1]	(1)	0
Net actuarial loss, Pre-Tax	[1]	37	40
Net actuarial loss, Tax	[1]	7	10
Net actuarial loss, Net of Tax	[1]	30	30
Subtotal, Pre-Tax		36	40
Subtotal, Tax		7	10
Subtotal, Net of Tax		29	30
Effect of remeasurement, Pre-tax		0	9
Effect of remeasurement, Tax		0	2
Effect of remeasurement, Net of Tax		0	7
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
Effect of settlement, Tax		0	0
Effect of settlement, Net of Tax		0	1
Foreign currency translation adjustment, Pre-Tax		(120)	(15)
Foreign currency translation adjustment, Tax		(20)	(3)
Foreign currency translation adjustment, Net of Tax		(100)	(12)
Other, Pre-Tax		0	(1)
Other, Tax		0	0
Other, Net of Tax		0	(1)
Pension/post-retirement plans (losses) gains, Pre-Tax		(84)	33
Pension/post-retirement plans (losses) gains, Tax		(13)	9
Pension/post-retirement plans (losses) gains, Net of Tax		(71)	24
Other comprehensive income, before tax		144	263
Other comprehensive income (loss), Tax		(8)	7
Other comprehensive income, net of tax		$ 152	$ 256

[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.