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Fair value measurements Assets Held in Trusts for Retirement Benefits (Details) - Fair value measurements on a recurring basis - USD ($) $ in Millions | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Estimated fair value | Pension benefits |  |
Fair value measurements on a recurring basis |  |
Total assets | $ 1,291 | $ 1,233
Cash, receivables and payables, net | (25) | (46)
Fair value of plan assets | 1,266 | 1,187
Estimated fair value | Pension benefits | Equity securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 649 | 672
Estimated fair value | Pension benefits | Equity index funds |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 132 | 127
Estimated fair value | Pension benefits | Fixed income securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 428 | 350
Estimated fair value | Pension benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 82 | 84
Estimated fair value | Other benefits |  |
Fair value measurements on a recurring basis |  |
Total assets | 181 | 180
Cash, receivables and payables, net | (1) | (1)
Fair value of plan assets | 180 | 179
Estimated fair value | Other benefits | Equity securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 99 | 102
Estimated fair value | Other benefits | Equity index funds |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 19 | 19
Estimated fair value | Other benefits | Fixed income securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 49 | 46
Estimated fair value | Other benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 14 | 13
Level 1 | Pension benefits |  |
Fair value measurements on a recurring basis |  |
Total assets | 903 | 921
Level 1 | Pension benefits | Equity securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 649 | 672
Level 1 | Pension benefits | Equity index funds |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 132 | 127
Level 1 | Pension benefits | Fixed income securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 121 | 122
Level 1 | Pension benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 1 | 0
Level 1 | Other benefits |  |
Fair value measurements on a recurring basis |  |
Total assets | 164 | 161
Level 1 | Other benefits | Equity securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 99 | 102
Level 1 | Other benefits | Equity index funds |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 19 | 19
Level 1 | Other benefits | Fixed income securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 43 | 40
Level 1 | Other benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 3 |
Level 2 | Pension benefits |  |
Fair value measurements on a recurring basis |  |
Total assets | 388 | 311
Level 2 | Pension benefits | Fixed income securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 307 | 228
Level 2 | Pension benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 81 | 83
Level 2 | Other benefits |  |
Fair value measurements on a recurring basis |  |
Total assets | 17 | 19
Level 2 | Other benefits | Fixed income securities |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 6 | 6
Level 2 | Other benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | 11 | 13
Level 3 | Pension benefits |  |
Fair value measurements on a recurring basis |  |
Total assets | 0 | 1
Level 3 | Pension benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring basis |  |
Fair value of plan assets | $ 0 | $ 1

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