Employee Benefit Plans (Changes In Defined Benefit Obligation And Fair Value Of Defined Benefit Plan Assets) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning		$ 2,194
Defined Benefit Plan, Divestitures, Plan Assets		(1)
Fair value of plan assets, ending	$ 2,194	1,922	$ 2,194
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, beginning		3,305	2,814
Service cost		92	71	$ 84
Interest cost		112	126	114
Actuarial loss (gain)		(117)	688
Employee contributions		2	2
Curtailments		(2)	(5)
Settlements		(323)	(304)
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation		0	136
Defined Benefit Plan, Divestitures, Benefit Obligation		(1)
Benefits paid		(91)	(109)
Plan Amendments		(1)	(4)
Actual expenses		(2)	(2)
Foreign currency effects		(94)	(108)
Benefit obligation, ending	3,305	2,880	3,305	2,814
Fair value of plan assets, beginning		2,194	2,341
Actual return on plan assets		(7)	292
Employer contributions		222	42
Settlements		(328)	(304)
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets		0	10
Foreign currency effects		(67)	(78)
Fair value of plan assets, ending	2,194	1,922	2,194	2,341
Funded status	(1,111)	(958)	(1,111)
Prepaid benefit cost	27	32	27
Accrued benefit liability - current	(17)	(16)	(17)
Accrued benefit liability - long-term	(1,121)	(974)	(1,121)
Net amount recognized in the balance sheet	(1,111)	(958)	(1,111)
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, beginning		231	174
Service cost		5	4	5
Interest cost		8	8	7
Actuarial loss (gain)		(32)	54
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation		0	0
Defined Benefit Plan, Divestitures, Benefit Obligation		(1)
Benefits paid		(11)	(12)
Plan Amendments	0		3
Foreign currency effects		(1)
Benefit obligation, ending	231	199	231	$ 174
Employer contributions		11	12
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets		0	0
Funded status	(231)	(199)	(231)
Accrued benefit liability - current	(12)	(13)	(12)
Accrued benefit liability - long-term	(219)	(186)	(219)
Net amount recognized in the balance sheet	$ (231)	$ (199)	$ (231)