Employee Benefits (Details 5) (USD $) | Dec. 31, 2013 | Dec. 31, 2012 |
In Millions, unless otherwise specified |
Fair value of defined benefit plans assets by asset class | ' | ' |
Fair value of defined benefit plans assets by asset class, Total | $2,088 | $1,851 |
Level 1 [Member] | ' | ' |
Fair value of defined benefit plans assets by asset class | ' | ' |
Fair value of defined benefit plans assets by asset class, Total | 722 | 650 |
Level 2 [Member] | ' | ' |
Fair value of defined benefit plans assets by asset class | ' | ' |
Fair value of defined benefit plans assets by asset class, Total | 1,366 | 1,183 |
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 | 18 |
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 | 68 | 180 |
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 | 20 | 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 | 48 | 178 |
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 | 514 | 399 |
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 | 145 | 119 |
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 | 369 | 280 |
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 | 373 | 344 |
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 | 325 | 307 |
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 | 48 | 37 |
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 | 183 | 154 |
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 | 101 | 85 |
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 | 82 | 69 |
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 | 227 | 225 |
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 | 131 | 137 |
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 | 96 | 87 |
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 | 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 | 517 | 370 |
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 | 517 | 370 |
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 | 11 | 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 | 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 | 11 | 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 | 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 | 7 | 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 | 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 | 7 | 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 | 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 | 16 | 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 | 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 | 16 | 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 | 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 | 45 | 52 |
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 | 45 | 52 |
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 | 66 | 41 |
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 | 66 | 41 |
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 | 61 | 43 |
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 | 61 | 43 |
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 |
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 |
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 |
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 |