Supplemental Equity and Comprehensive Income Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	$ (3,841)	$ (5,001)	$ (3,913)	$ (4,750)
Other comprehensive income (loss), before tax:
Amounts before reclassification	108	(345)	125	(704)
Amounts reclassified out	97	235	182	451
Total other comprehensive income (loss), before tax	205	(110)	307	(253)
Tax effect	(30)	(55)	(60)	(163)
Total other comprehensive income (loss), net of tax	175	(165)	247	(416)
Balance at End of Period	(3,666)	(5,166)	(3,666)	(5,166)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(180)	(130)	(188)	230
Other comprehensive income (loss), before tax:
Amounts before reclassification	128	(260)	134	(584)
Amounts reclassified out	0	0	0	0
Total other comprehensive income (loss), before tax	128	(260)	134	(584)
Tax effect	(5)	0	(3)	(36)
Total other comprehensive income (loss), net of tax	123	(260)	131	(620)
Balance at End of Period	(57)	(390)	(57)	(390)
Defined Benefit Pension and Postretirement Plans Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(3,654)	(4,870)	(3,715)	(4,955)
Other comprehensive income (loss), before tax:
Amounts before reclassification	0	0	0	0
Amounts reclassified out	92	144	183	287
Total other comprehensive income (loss), before tax	92	144	183	287
Tax effect	(32)	(53)	(62)	(111)
Total other comprehensive income (loss), net of tax	60	91	121	176
Balance at End of Period	(3,594)	(4,779)	(3,594)	(4,779)
Debt and Equity Securities, Unrealized Gain (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(1)	(2)	(2)	(2)
Other comprehensive income (loss), before tax:
Amounts before reclassification	1	(6)	3	(6)
Amounts reclassified out	0	0	0	0
Total other comprehensive income (loss), before tax	1	(6)	3	(6)
Tax effect	0	2	(1)	2
Total other comprehensive income (loss), net of tax	1	(4)	2	(4)
Balance at End of Period	0	(6)	0	(6)
Cash Flow Hedging Instruments Unrealized Gain (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(6)	1	(8)	(23)
Other comprehensive income (loss), before tax:
Amounts before reclassification	(21)	(79)	(12)	(114)
Amounts reclassified out	5	91	(1)	164
Total other comprehensive income (loss), before tax	(16)	12	(13)	50
Tax effect	7	(4)	6	(18)
Total other comprehensive income (loss), net of tax	(9)	8	(7)	32
Balance at End of Period	$ (15)	$ 9	$ (15)	$ 9