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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
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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.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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