Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax		$ (529)	$ 290	$ (301)	$ 525
Foreign currency translation adjustments, Tax		(13)	1	(8)	1
Foreign currency translation adjustments, Net of Tax		(516)	289	(293)	524
Unrealized investment gains (losses), Pre-Tax		0	24	0	19
Unrealized investment gains (losses), Tax		0	10	0	8
Unrealized investment gains (losses), Net of Tax		0	14	0	11
Pension/post-retirement plans:
Prior services credits, Pre-Tax	[1]	(1)	0	(2)	0
Prior service credits, Tax	[1]	0	0	0	0
Prior service credits, Net of Tax	[1]	(1)	0	(2)	0
Net actuarial loss, Pre-Tax	[1]	37	42	74	82
Net actuarial loss, Tax	[1]	9	9	16	19
Net actuarial loss, Net of Tax	[1]	28	33	58	63
Subtotal, Pre-Tax		36	42	72	82
Subtotal, Tax		9	9	16	19
Subtotal, Net of Tax		27	33	56	63
Effect of remeasurement, Pre-tax		0	0	0	9
Effect of remeasurement, Tax		0	1	0	3
Effect of remeasurement, Net of Tax		0	(1)	0	6
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		156	(47)	36	(62)
Foreign currency translation adjustment, Tax		27	(8)	7	(11)
Foreign currency translation adjustment, Net of Tax		129	(39)	29	(51)
Other, Pre-Tax				0	(1)
Other, Tax				0	0
Other, Net of Tax				0	(1)
Pension/post-retirement plans (losses) gains, Pre-Tax		192	(5)	108	28
Pension/post-retirement plans (losses) gains, Tax		36	2	23	11
Pension/post-retirement plans (losses) gains, Net of Tax		156	(7)	85	17
Other comprehensive (loss) income, before tax		(337)	309	(193)	572
Other comprehensive income (loss), Tax		23	13	15	20
Other comprehensive (loss) income, net of tax		$ (360)	$ 296	$ (208)	$ 552

[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.