Postretirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,886	$ 1,649	$ 1,406
Interest cost	2,906	3,005	3,116
Expected return on plan assets	(3,874)	(3,831)	(3,741)
Amortization of prior service costs	196	225	244
Recognized net actuarial loss	2,231	1,937	1,254
Settlement and curtailment loss	104	25	64
Net periodic benefit cost	3,449	3,010	2,343
Net periodic benefit cost included in Earnings from operations	3,036	2,407	1,648
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	148	146	221
Interest cost	263	313	484
Expected return on plan assets	(6)	(7)	(6)
Amortization of prior service costs	(180)	(197)	(96)
Recognized net actuarial loss	95	119	178
Settlement and curtailment loss		(1)	3
Net periodic benefit cost	320	373	784
Net periodic benefit cost included in Earnings from operations	$ 353	$ 543	$ 692