Other Comprehensive Income (Loss) (Schedule Of Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Foreign currency translation adjustments, Pre-Tax	$ (639)	$ (527)	$ (86)
Foreign currency translation adjustments, Tax (Credit)	4	(12)	(2)
Foreign currency translation adjustments, Net of Tax	(643)	(515)	(84)
Unrealized investment gains (losses), Pre-Tax	1	0	1
Unrealized investment gains (losses), Tax (Credit)	0		0
Unrealized investment gains (losses), Net of Tax	1		1
Pension/post-retirement plans:
Amortization of prior service credits, Pre-Tax	(1)	(16)	(22)
Amortization of prior service credits, Tax (Credit)	0	(5)	(8)
Amortization of prior service credits, Net of Tax	(1)	(11)	(14)
Net actuarial losses, Pre-Tax	271	242	317
Net actuarial losses, Tax (Credit)	96	74	108
Net actuarial losses, Net of Tax	175	168	209
Losses included in periodic pension cost, Pre-Tax	270	226	295
Losses including in periodic pension cost, Tax (Credit)	96	69	100
Losses including in periodic pension cost, Net of Tax	174	157	195
Curtailment gain, Pre-Tax	(3)	(65)
Curtailment gain, Tax (Credit)	0	(13)
Curtailment gain, Net of Tax	(3)	(52)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Termination, Before Tax	(6)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Termination, Tax	(3)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Termination, Net of Tax	(3)
Net gain (loss) arising during period, Pre-Tax	(125)	(1,418)	898
Net gain (loss) arising during period, Tax (Credit)	(62)	(466)	339
Net gain (loss) arising during period, Net of Tax	(63)	(952)	559
Foreign currency translation adjustments, Pre-Tax	214	180	27
Foreign currency translation adjustments, Tax (Credit)	43	39	8
Foreign currency translation adjustments, Net of Tax	171	141	19
Other adjustments. Pre-Tax	(13)	(8)	(7)
Other adjustments, Tax (Credit)	(6)	(3)	(3)
Other adjustments, Net of Tax	(7)	(5)	(4)
Pension/post-retirement plans gains (losses), Pre-Tax	337	(1,085)	1,213
Pension/post-retirement plans gains (losses), Tax (Credit)	68	(374)	444
Pension/post-retirement plans gains (losses), Net of Tax	269	(711)	769
Other comprehensive (loss) income, before tax	(301)	(1,612)	1,128
Other comprehensive income (loss), Tax (Credit)	72	(386)	442
Other comprehensive (loss) income, net of tax	$ (373)	$ (1,226)	$ 686