Other Comprehensive Income (Loss) (Schedule Of Components Of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax		$ 127	$ (52)	$ 652	$ (373)
Foreign currency translation adjustments, Tax		1	2	2	1
Foreign currency translation adjustments, Net of Tax		126	(54)	650	(374)
Unrealized investment gains (losses), Pre-Tax		(8)	1	11	1
Unrealized investment gains (losses), Tax		(3)	0	5	0
Unrealized investment gains (losses), Net of Tax		(5)	1	6	1
Pension/post-retirement plans:
Prior services losses (gains), Pre-Tax	[1]	0	1	0	2
Prior service losses (gains), Tax	[1]	0	1	0	1
Prior Service losses (gains), Net of Tax	[1]	0	0	0	1
Net actuarial loss, Pre-Tax	[1]	43	41	125	125
Net actuarial loss, Tax	[1]	10	12	29	36
Net actuarial loss, Net of Tax	[1]	33	29	96	89
Subtotal, Pre-Tax		43	42	125	127
Subtotal, Tax		10	13	29	37
Subtotal, Net of Tax		33	29	96	90
Effect of remeasurement, Pre-tax		3	0	12	(1)
Effect of remeasurement, Tax		0	0	3	0
Effect of remeasurement, Net of Tax		3	0	9	(1)
Effect of curtailment, Pre-Tax				(1)	3
Effect of curtailment, Tax				0	1
Effect of curtailment, Net of Tax				(1)	2
Effect of settlement, Pre-tax		1	0	2	1
Effect of settlement, Tax		0	0	0	0
Effect of settlement, Net of Tax		1	0	2	1
Foreign currency translation adjustment, Pre-Tax		(215)	40	(277)	253
Foreign currency translation adjustment, Tax		(38)	4	(49)	41
Foreign currency translation adjustment, Net of Tax		(177)	36	(228)	212
Other, Pre-Tax				(1)	0
Other, Tax				0	0
Other, Net of Tax				(1)	0
Pension/post-retirement plans (losses) gains, Pre-Tax		(168)	82	(140)	383
Pension/post-retirement plans (losses) gains, Tax		(28)	17	(17)	79
Pension/post-retirement plans (losses) gains, Net of Tax		(140)	65	(123)	304
Other comprehensive (loss) income, before tax		(49)	31	523	11
Other comprehensive income (loss), Tax		(30)	19	(10)	80
Other comprehensive (loss) income, net of tax		$ (19)	$ 12	$ 533	$ (69)

[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.