Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			0 Months Ended	1 Months Ended	2 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Reclassification out of Accumulated Other Comprehensive Income [Member]	May 01, 2013 Dividend Declared [Member]	May 22, 2013 Dividend Declared [Member]	Jun. 19, 2013 Dividend Declared [Member]	Mar. 31, 2013 Common Stock [Member]	Mar. 31, 2012 Common Stock [Member]	Mar. 31, 2013 Treasury Stock [Member]	Mar. 31, 2012 Treasury Stock [Member]	Mar. 31, 2013 Parent [Member]	Mar. 31, 2012 Parent [Member]	Mar. 31, 2013 Noncontrolling Interest [Member]	Mar. 31, 2012 Noncontrolling Interest [Member]	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 31, 2013 Foreign Currency Translation Adjustment [Member]	Mar. 31, 2013 Defined Benefit Pension Items [Member]	Mar. 31, 2013 Defined Benefit Pension Items [Member] Reclassification out of Accumulated Other Comprehensive Income [Member]		Mar. 31, 2013 Gains and (Losses) on Cash Flow Hedges [Member]	Mar. 31, 2013 Gains and (Losses) on Cash Flow Hedges [Member] Reclassification out of Accumulated Other Comprehensive Income [Member]	Mar. 31, 2013 Gains and (Losses) on Cash Flow Hedges [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Commodity Contract [Member]	Mar. 31, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member]	Mar. 31, 2012 Shares Purchased Related To Stock-Based Compensation Plans [Member]	Mar. 31, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] Treasury Stock [Member]	Mar. 31, 2012 Shares Purchased Related To Stock-Based Compensation Plans [Member] Treasury Stock [Member]	Mar. 31, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] Parent [Member]	Mar. 31, 2012 Shares Purchased Related To Stock-Based Compensation Plans [Member] Parent [Member]	Mar. 31, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] Noncontrolling Interest [Member]	Mar. 31, 2012 Shares Purchased Related To Stock-Based Compensation Plans [Member] Noncontrolling Interest [Member]	Mar. 31, 2013 Shares Purchased Under Programs [Member]	Mar. 31, 2012 Shares Purchased Under Programs [Member]	Mar. 31, 2013 Shares Purchased Under Programs [Member] Treasury Stock [Member]	Mar. 31, 2012 Shares Purchased Under Programs [Member] Treasury Stock [Member]	Mar. 31, 2013 Shares Purchased Under Programs [Member] Parent [Member]	Mar. 31, 2012 Shares Purchased Under Programs [Member] Parent [Member]	Mar. 31, 2013 Shares Purchased Under Programs [Member] Noncontrolling Interest [Member]	Mar. 31, 2012 Shares Purchased Under Programs [Member] Noncontrolling Interest [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period	$ 18,095	$ 16,445									$ 18,032	$ 16,423	$ 63	$ 22
Net income (loss)	652	(432)	(3)								654	(432)	(2)	0				(5)			2
Dividends	(111)	(83)									(111)	(83)	0	0
Stock-based compensation expense	11	10									11	10	0	0
Tax deduction in excess of stock-based compensation expense	24	2									24	2	0	0
Transactions in connection with stock-based compensation plans
Stock issuances	38	9									38	9	0	0
Stock repurchases under buyback program																							(24)	(95)			(24)	(95)	0	0	(294)	0			(294)	0	0	0
Contributions from noncontrolling interests	14	11									0	0	14	11
Other comprehensive income	13	125									13	125	0	0	13	(204)	218			(1)
Balance as of end of period	18,418	15,992									18,343	15,959	75	33
Share Activity
Common stock, shares, beginning balance							673,000,000	673,000,000
Treasury stock, shares, beginning balance	(121,406,520)								(121,000,000)	(117,000,000)
Stock issuances, stock-based compensation							0	0	3,000,000	1,000,000
Stock purchases, stock-based compensation																									0	(5,000,000)							(7,000,000)	0
Common stock, shares, ending balance							673,000,000	673,000,000
Treasury Stock, shares, ending balance	(125,469,048)								(125,000,000)	(121,000,000)
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income
Beginning balance, accumulated other comprehensive income, net of tax	108														108	665	(558)			1
Other comprehensive income (loss) before reclassifications															10	(204)	213			1
Amounts reclassified from accumulated other comprehensive income															3	0	5			(2)
Other comprehensive income	13	125									13	125	0	0	13	(204)	218			(1)
Ending balance, accumulated other comprehensive income, net of tax	121														121	461	(340)			0
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Net actuarial loss, amortization of defined benefit pension items																		(14)	[1]
Prior service credit, amortization of defined benefit pension items																		6	[1]
Cost of sales																						3
Income (loss) before income tax expense	992	(337)																(8)			3
Tax (expense) benefit	(340)	(95)																3			(1)
Net of tax	$ 652	$ (432)	$ (3)								$ 654	$ (432)	$ (2)	$ 0				$ (5)			$ 2
Equity (Textual)
Dividends payable, date declared				May 01, 2013
Dividends payable, amount per share				$ 0.20
Dividends payable, date to be paid						Jun. 19, 2013
Dividends payable, date of record					May 22, 2013

[1] (a) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost, as further discussed in Note 8. Net periodic benefit cost is reflected in operating expenses and general and administrative expenses.