Schedule Of Unallocated Items and Eliminations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Share-based plans			$ (144)	$ (141)
Earnings from operations	$ 2,282	$ 2,580	3,651	6,282
Pension Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Postretirement Expense	(453)	(529)	(1,545)	(1,837)
Other Postretirement Benefit Plan, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Postretirement Expense	(63)	(65)	(213)	(226)
Unallocated items, eliminations and other [Member]
Segment Reporting Information [Line Items]
Share-based plans	(9)	(20)	(50)	(57)
Deferred compensation	(33)	38	(38)	(10)
Amortization of previously capitalized interest	(23)	(21)	(71)	(70)
Total Other and Eliminations	(135)	(160)	(333)	(324)
Sub-total	(200)	(163)	(492)	(461)
Pension and Postretirement Expense	88	(57)	251	(200)
Earnings from operations	(112)	(220)	(241)	(661)
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Postretirement Expense	50	(84)	129	(293)
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Postretirement Expense	$ 38	$ 27	$ 122	$ 93