Other Comprehensive Income (Loss) (Schedule Of Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax		$ (742)	$ (639)	$ (527)
Foreign currency translation adjustments, Tax (Credit)		36	4	(12)
Foreign currency translation adjustments, Net of Tax		(778)	(643)	(515)
Unrealized investment gains (losses), Pre-Tax		21	1	0
Unrealized investment gains (losses), Tax (Credit)		8	0	0
Unrealized investment gains (losses), Net of Tax		13	1	0
Pension/post-retirement plans:
Amortization of prior service credits, Pre-Tax	[1]	3	(1)	(16)
Amortization of prior service credits, Tax (Credit)	[1]	1	0	(5)
Amortization of prior service credits, Net of Tax	[1]	2	(1)	(11)
Net actuarial losses, Pre-Tax	[1]	166	271	242
Net actuarial losses, Tax (Credit)	[1]	46	96	74
Net actuarial losses, Net of Tax	[1]	120	175	168
Losses included in periodic pension cost, Pre-Tax		169	270	226
Losses including in periodic pension cost, Tax (Credit)		47	96	69
Losses including in periodic pension cost, Net of Tax		122	174	157
Curtailment gain, Pre-Tax		102	(3)	(65)
Curtailment gain, Tax (Credit)		38	0	(13)
Curtailment gain, Net of Tax		64	(3)	(52)
Plan termination, Pre-Tax		0	(6)	0
Plan termination, Tax (Credit)		0	(3)	0
Plan termination, Net of Tax		0	(3)	0
Net gain (loss) arising during period, Pre-Tax		(855)	(125)	(1,418)
Net gain (loss) arising during period, Tax (Credit)		(175)	(62)	(466)
Net gain (loss) arising during period, Net of Tax		(680)	(63)	(952)
Foreign currency translation adjustments, Pre-Tax		416	214	180
Foreign currency translation adjustments, Tax (Credit)		70	43	39
Foreign currency translation adjustments, Net of Tax		346	171	141
Other adjustments. Pre-Tax		49	(13)	(8)
Other adjustments, Tax (Credit)		9	(6)	(3)
Other adjustments, Net of Tax		40	(7)	(5)
Pension/post-retirement plans gains (losses), Pre-Tax		(119)	337	(1,085)
Pension/post-retirement plans gains (losses), Tax (Credit)		(11)	68	(374)
Pension/post-retirement plans gains (losses), Net of Tax		(108)	269	(711)
Other comprehensive loss, before tax		(840)	(301)	(1,612)
Other comprehensive income (loss), Tax (Credit)		33	72	(386)
Other comprehensive loss, net of tax		$ (873)	$ (373)	$ (1,226)

[1] (a) 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.