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Employee Benefits (Details 5) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | $ 1,851 |  | $ 1,505 |
Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 650 |  | 732 |
Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 1,183 |  | 750 |
Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 18 |  | 23 |
Cash and short-term investments, and other [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 180 |  | 32 |
Cash and short-term investments, and other [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 2 |  | 2 |
Cash and short-term investments, and other [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 178 |  | 30 |
Cash and short-term investments, and other [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  | 0 |
US indexed equity securities [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 399 | [1] | 306 | [1]
US indexed equity securities [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 119 | [1] | 125 | [1]
US indexed equity securities [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 280 | [1] | 181 | [1]
US indexed equity securities [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [1] | 0 | [1]
US growth and value securities [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 344 |  | 370 |
US growth and value securities [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 307 |  | 370 |
US growth and value securities [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 37 |  | 0 |
US growth and value securities [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  | 0 |
UK equity securities [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 154 |  | 144 |
UK equity securities [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 85 |  | 78 |
UK equity securities [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 69 |  | 66 |
UK equity securities [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  | 0 |
International equity securities excluding UK [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 225 |  | 297 |
International equity securities excluding UK [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 137 |  | 157 |
International equity securities excluding UK [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 87 |  | 139 |
International equity securities excluding UK [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 1 |  | 1 |
Long duration bonds [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 370 | [2] | 195 | [2]
Long duration bonds [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [2] | 0 | [2]
Long duration bonds [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 370 | [2] | 195 | [2]
Long duration bonds [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [2] | 0 | [2]
Intermediate Duration Securities [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 3 |  |  |
Intermediate Duration Securities [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  |  |
Intermediate Duration Securities [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 3 |  |  |
Intermediate Duration Securities [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  |  |
Agency mortgage backed securities |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 13 |  |  |
Agency mortgage backed securities | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  |  |
Agency mortgage backed securities | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 13 |  |  |
Agency mortgage backed securities | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  |  |
Asset-backed Securities [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 10 |  |  |
Asset-backed Securities [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  |  |
Asset-backed Securities [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 10 |  |  |
Asset-backed Securities [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  |  |
Non-agency mortgage backed securities [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 52 | [3] | 66 | [3]
Non-agency mortgage backed securities [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [3] | 0 | [3]
Non-agency mortgage backed securities [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 52 | [3] | 66 | [3]
Non-agency mortgage backed securities [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [3] | 0 | [3]
UK fixed income securities [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 41 | [4] | 45 | [4]
UK fixed income securities [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [4] | 0 | [4]
UK fixed income securities [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 41 | [4] | 45 | [4]
UK fixed income securities [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [4] | 0 | [4]
International fixed income securities excluding UK [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 43 |  | 28 |
International fixed income securities excluding UK [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  | 0 |
International fixed income securities excluding UK [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 43 |  | 28 |
International fixed income securities excluding UK [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 |  | 0 |
Real estate UK [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 17 | [5] | 22 | [5]
Real estate UK [Member] | Level 1 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [5] | 0 | [5]
Real estate UK [Member] | Level 2 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | 0 | [5] | 0 | [5]
Real estate UK [Member] | Level 3 [Member] |  |  |  |
Fair value of defined benefit plans assets by asset class |  |  |  |
Fair value of defined benefit plans assets by asset class, Total | $ 17 | [5] | $ 22 | [5]
[1] | Includes securities that are tracked in the following indexes: S&P 500, S&P MidCap 400, S&P MidCap 400 Growth and S&P Smallcap 600.
[2] | Includes securities that are investment grade obligations of issuers in the U.S.
[3] | Includes U.S. mortgage-backed securities that are not backed by the U.S. government.
[4] | Includes securities originated by the government of and other issuers from the U.K.
[5] | Includes a fund which holds real estate properties in the U.K.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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