Schedule Of Unallocated Items and Eliminations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Share-based plans			$ (152)	$ (156)
Earnings from operations	2,119	1,803	5,448	5,047
Pension Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Postretirement Expense	(715)	(775)	(2,443)	(2,319)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Postretirement Expense	(71)	(90)	(214)	(269)
Unallocated items, eliminations and other [Member]
Segment Reporting Information [Line Items]
Share-based plans	(22)	(21)	(66)	(74)
Deferred compensation	(3)	(63)	(22)	(165)
Amortization of previously capitalized interest	(19)	(18)	(55)	(52)
Eliminations and other unallocated items	(168)	(80)	(472)	(339)
Sub-total	(212)	(182)	(615)	(630)
Pension and Postretirement Expense	(311)	(340)	(1,068)	(991)
Earnings from operations	(523)	(522)	(1,683)	(1,621)
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Postretirement Expense	(331)	(356)	(1,135)	(1,045)
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Postretirement Expense	$ 20	$ 16	$ 67	$ 54