Supplemental Equity and Comprehensive Income Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	$ (3,666)	$ (5,166)	$ (3,913)	$ (4,750)
Other comprehensive income (loss), before tax:
Amounts before reclassification	(440)	248	(315)	(456)
Amounts reclassified out	98	101	280	552
Total other comprehensive income (loss), before tax	(342)	349	(35)	96
Tax effect	(125)	7	(185)	(156)
Total other comprehensive income (loss), net of tax	(467)	356	(220)	(60)
Impact From Purchase Of Subsidiary Shares	25		25
Balance at End of Period	(4,108)	(4,810)	(4,108)	(4,810)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(57)	(390)	(188)	230
Other comprehensive income (loss), before tax:
Amounts before reclassification	(537)	240	(403)	(344)
Amounts reclassified out	0	0	0	0
Total other comprehensive income (loss), before tax	(537)	240	(403)	(344)
Tax effect	(56)	46	(59)	10
Total other comprehensive income (loss), net of tax	(593)	286	(462)	(334)
Impact From Purchase Of Subsidiary Shares	41		41
Balance at End of Period	(609)	(104)	(609)	(104)
Defined Benefit Pension and Postretirement Plans Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(3,594)	(4,779)	(3,715)	(4,955)
Other comprehensive income (loss), before tax:
Amounts before reclassification	0	0	0	0
Amounts reclassified out	89	144	272	431
Total other comprehensive income (loss), before tax	89	144	272	431
Tax effect	(30)	(52)	(92)	(163)
Total other comprehensive income (loss), net of tax	59	92	180	268
Impact From Purchase Of Subsidiary Shares	(16)		(16)
Balance at End of Period	(3,551)	(4,687)	(3,551)	(4,687)
Debt and Equity Securities, Unrealized Gain (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	0	(6)	(2)	(2)
Other comprehensive income (loss), before tax:
Amounts before reclassification	(1)	3	2	(3)
Amounts reclassified out	0	0	0	0
Total other comprehensive income (loss), before tax	(1)	3	2	(3)
Tax effect	0	(1)	(1)	1
Total other comprehensive income (loss), net of tax	(1)	2	1	(2)
Impact From Purchase Of Subsidiary Shares	0		0
Balance at End of Period	(1)	(4)	(1)	(4)
Cash Flow Hedging Instruments Unrealized Gain (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(15)	9	(8)	(23)
Other comprehensive income (loss), before tax:
Amounts before reclassification	98	5	86	(109)
Amounts reclassified out	9	(43)	8	121
Total other comprehensive income (loss), before tax	107	(38)	94	12
Tax effect	(39)	14	(33)	(4)
Total other comprehensive income (loss), net of tax	68	(24)	61	8
Impact From Purchase Of Subsidiary Shares	0		0
Balance at End of Period	$ 53	$ (15)	$ 53	$ (15)