Supplemental Equity and Comprehensive Income Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	$ (3,913)	$ (4,750)
Other comprehensive income (loss), before tax:
Amounts before reclassification	16	(359)
Amounts reclassified out	85	216
Total other comprehensive income (loss), before tax	101	(143)
Tax effect	(29)	(108)
Total other comprehensive income (loss), net of tax	72	(251)
Balance at End of Period	(3,841)	(5,001)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(188)	230
Other comprehensive income (loss), before tax:
Amounts before reclassification	5	(324)
Amounts reclassified out	0	0
Total other comprehensive income (loss), before tax	5	(324)
Tax effect	3	(36)
Total other comprehensive income (loss), net of tax	8	(360)
Balance at End of Period	(180)	(130)
Defined Benefit Pension and Postretirement Plans Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(3,715)	(4,955)
Other comprehensive income (loss), before tax:
Amounts before reclassification	0	0
Amounts reclassified out	91	143
Total other comprehensive income (loss), before tax	91	143
Tax effect	(30)	(58)
Total other comprehensive income (loss), net of tax	61	85
Balance at End of Period	(3,654)	(4,870)
Debt and Equity Securities, Unrealized Gain (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(2)	(2)
Other comprehensive income (loss), before tax:
Amounts before reclassification	2	0
Amounts reclassified out	0	0
Total other comprehensive income (loss), before tax	2	0
Tax effect	(1)	0
Total other comprehensive income (loss), net of tax	1	0
Balance at End of Period	(1)	(2)
Cash Flow Hedging Instruments Unrealized Gain (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(8)	(23)
Other comprehensive income (loss), before tax:
Amounts before reclassification	9	(35)
Amounts reclassified out	(6)	73
Total other comprehensive income (loss), before tax	3	38
Tax effect	(1)	(14)
Total other comprehensive income (loss), net of tax	2	24
Balance at End of Period	$ (6)	$ 1