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Long-Term Borrowings and Capital Lease Obligations (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Medium-term notes due 2013-2041 [Member] | Dec. 31, 2012 Medium-term notes due 2013-2041 [Member] | Dec. 31, 2013 5.00% notes due 2013, Note 1 [Member] | Dec. 31, 2012 5.00% notes due 2013, Note 1 [Member] | Dec. 31, 2013 5.00% notes due 2013, Note 2 [Member] | Dec. 31, 2012 5.00% notes due 2013, Note 2 [Member] | Dec. 31, 2013 5.875% notes due 2014 [Member] | Dec. 31, 2012 5.875% notes due 2014 [Member] | Dec. 31, 2013 1.75% notes due 2014 [Member] | Dec. 31, 2012 1.75% notes due 2014 [Member] | Dec. 31, 2013 Floating rate notes due 2014 [Member] | Dec. 31, 2012 Floating rate notes due 2014 [Member] | Dec. 31, 2013 4.875% notes due 2014 [Member] | Dec. 31, 2012 4.875% notes due 2014 [Member] | Dec. 31, 2013 3.25% notes due 2015 [Member] | Dec. 31, 2012 3.25% notes due 2015 [Member] | Dec. 31, 2013 3.25% notes due 2015 [Member] Interest Rate Swap [Member] | Dec. 31, 2012 3.25% notes due 2015 [Member] Interest Rate Swap [Member] | Dec. 31, 2013 4.75% notes due 2015 [Member] | Dec. 31, 2012 4.75% notes due 2015 [Member] | Dec. 31, 2013 1.95% notes due 2016 [Member] | Dec. 31, 2012 1.95% notes due 2016 [Member] | Dec. 31, 2013 2.75% notes due 2016 [Member] | Dec. 31, 2012 2.75% notes due 2016 [Member] | Dec. 31, 2013 5.25% notes due 2016 [Member] | Dec. 31, 2012 5.25% notes due 2016 [Member] | Dec. 31, 2013 6.00% notes due 2018 [Member] | Dec. 31, 2012 6.00% notes due 2018 [Member] | Dec. 31, 2008 6.00% notes due 2018 [Member] Interest Rate Swap [Member] | Dec. 31, 2013 5.75% notes due 2019 [Member] | Dec. 31, 2012 5.75% notes due 2019 [Member] | Dec. 31, 2013 4.625% notes due 2020 [Member] | Dec. 31, 2012 4.625% notes due 2020 [Member] | Dec. 31, 2013 3.625% notes due 2021 [Member] | Dec. 31, 2012 3.625% notes due 2021 [Member] | Dec. 31, 2013 4.25% notes due 2021 [Member] | Dec. 31, 2012 4.25% notes due 2021 [Member] | Dec. 31, 2013 2.80% notes due 2023 [Member] | Mar. 31, 2013 2.80% notes due 2023 [Member] | Dec. 31, 2012 2.80% notes due 2023 [Member] | Dec. 31, 2013 6.50% debentures due 2028 [Member] | Dec. 31, 2012 6.50% debentures due 2028 [Member] | Dec. 31, 2013 5.60% notes due 2036 [Member] | Dec. 31, 2012 5.60% notes due 2036 [Member] | Dec. 31, 2013 4.90% notes due 2041 [Member] | Dec. 31, 2012 4.90% notes due 2041 [Member] | Dec. 31, 2013 4.15% notes due 2043 [Member] | Mar. 31, 2013 4.15% notes due 2043 [Member] | Dec. 31, 2012 4.15% notes due 2043 [Member] | Dec. 31, 2013 Other Loans [Member] | Dec. 31, 2012 Other Loans [Member] | Dec. 31, 2013 Other Loans, Various Currencies [Member] | Dec. 31, 2012 Other Loans, Various Currencies [Member]
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 5.00% |  | 5.00% |  | 5.00% |  | 5.00% |  | 5.875% |  | 5.875% |  | 1.75% |  | 1.75% |  |  |  |  |  | 4.875% |  | 4.875% |  | 3.25% |  | 3.25% |  |  |  | 4.75% | 4.75% | 1.95% | 1.95% | 2.75% | 2.75% | 5.25% | 5.25% | 6.00% |  | 6.00% |  |  | 5.75% | 5.75% | 4.625% | 4.625% | 3.625% | 3.625% | 4.25% | 4.25% | 2.80% | 2.80% | 2.80% | 6.50% | 6.50% | 5.60% | 5.60% | 4.90% | 4.90% | 4.15% | 4.15% | 4.15% |  |  |  |  |  |  |  |
Medium-term notes |  |  | $ 121 | [1],[2] | $ 374 | [1],[2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  | 0 | [2] | 250 | [2] | 0 | [2] | 749 | [2] | 170 | [2] | 170 | [2] | 400 | [2] | 400 | [2] | 600 | [2],[3] | 600 | [2],[3] | 500 | [2] | 499 | [2] | 1,028 | [4] | 1,054 | [4] |  |  | 400 | 400 | 498 | 497 | 500 | 499 | 599 | 599 | 1,361 | [5] | 1,383 | [5] |  | 499 | 499 | 997 | 997 | 999 | 999 | 499 | 499 | 1,250 | 1,250 | 0 |  |  | 395 | 395 | 494 | 493 | 749 | 750 | 0 |  |  |  |  |  |  |  |
Debenture notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 299 | 299 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 | [2] | 36 | [2] | 1 | [2] | 2 | [2]
Total long-term debt | 12,392 | 11,693 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less short-term portion of long-term debt | 1,674 | 1,252 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt less current maturities | 10,718 | 10,441 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital lease obligations | 23 | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt and capital lease obligations | 10,741 | 10,465 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  | 0.00% |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.20% |  |  |  |  |  |  |
Interest rate on floating rate notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of interest rate swaps, asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29 | $ 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective yield of interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Average interest rates on medium-term notes at December 31, 2013 and 2012 were 0.0% and 4.0%, respectively.
[2] | Includes long-term debt due within one year.
[3] | Interest rate on floating rate notes at December 31, 2013 and 2012 was 0.7%.
[4] | At December 31, 2013 and 2012, the company had outstanding interest rate swap agreements with gross notional amounts of $1,000. Over the remaining terms of the notes, the company will receive fixed payments equivalent to the underlying debt and pay floating payments based on USD LIBOR (London Interbank Offered Rate). The fair value of outstanding swaps was an asset of $29 and $55 at December 31, 2013 and 2012, respectively.
[5] | During 2008, the interest rate swap agreement associated with these notes was terminated. The gain will be amortized over the remaining life of the bond, resulting in an effective yield of 3.85%.

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
Name: | us-gaap_SeniorNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant