Other Comprehensive Income Information (Amounts Reclassified Out Of Acc Other Comp Income) (Details) (Reclassification Out Of Accumulated Other Comprehensive Income [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Foreign exchange translation gain/(loss) included in net income (Statement of Income line: Other Income)			$ (82)
Accumulated Defined Benefit Plans Adjustment [Member]
Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs	(511)	[1]	(451)	[1]
Accumulated Net Unrealized Investment Gain Loss [Member]
Realized change in fair value of stock investments included in net income (Statement of Income line: Other income)	$ (12)

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 6 - Pension and Other Postretirement Benefits for additional details.)