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Employee Benefits (Details 4) - USD ($) $ in Millions | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, Total | $ 2,236 | $ 2,088
Level 1 [Member] |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, Total | 350 | 722
Level 2 [Member] |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, Total | 1,886 | 1,366
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
Cash and short-term investments [Member] |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, Total | 176 | 68
Cash and short-term investments [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 | 17 | 20
Cash and short-term investments [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 | 159 | 48
Cash and short-term investments [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 | 293 | 514
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 | 88 | 145
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 | 205 | 369
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 | 0
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 | 204 | 373
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 | 147 | 325
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 | 57 | 48
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 | 67 | 183
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 | 56 | 101
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 | 11 | 82
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 | 139 | 227
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 | 42 | 131
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 | 97 | 96
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 | 0 | 0
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 | 1,165 | 517
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 | 0
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 | 1,165 | 517
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 | 0
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 | 25 | 11
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 | 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 | 25 | 11
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 | 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 | 6 | 7
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 | 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 | 6 | 7
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 | 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 | 18 | 16
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 | 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 | 18 | 16
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 | 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 | 37 | 45
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 | 0
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 | 37 | 45
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 | 0
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 | 7 | 66
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 | 0
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 | 7 | 66
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 | 0
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 | 85 | 61
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 | 85 | 61
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
Other [Member] |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, Total | 14 |
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 | 0 |
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 | 14 |
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 |

X
- 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=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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