Retirement Benefits Plans (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
| United States pension benefit expense [Member] | ||||
| Retirement benefits plans expense | ||||
| Service cost | $ 30 | $ 29 | $ 61 | $ 58 |
| Interest cost | 39 | 41 | 78 | 81 |
| Expected return on plan assets | (65) | (62) | (131) | (123) |
| Amortization | 30 | 23 | 60 | 46 |
| Total | 34 | 31 | 68 | 62 |
| Settlement loss | 19 | 14 | 33 | 48 |
| Total expense | 53 | 45 | 101 | 110 |
| Non-United States pension benefit expense [Member] | ||||
| Retirement benefits plans expense | ||||
| Service cost | 19 | 17 | 37 | 33 |
| Interest cost | 18 | 22 | 36 | 44 |
| Expected return on plan assets | (25) | (25) | (50) | (50) |
| Amortization | 10 | 7 | 20 | 14 |
| Total | 22 | 21 | 43 | 41 |
| Settlement loss | 0 | 0 | 0 | 0 |
| Total expense | 22 | 21 | 43 | 41 |
| Other postretirement benefits expense [Member] | ||||
| Retirement benefits plans expense | ||||
| Service cost | 1 | 5 | 3 | 9 |
| Interest cost | 6 | 10 | 12 | 19 |
| Expected return on plan assets | (1) | (2) | (2) | (3) |
| Amortization | 1 | 2 | 1 | 4 |
| Total | 7 | 15 | 14 | 29 |
| Settlement loss | 0 | 0 | 0 | 0 |
| Total expense | $ 7 | $ 15 | $ 14 | $ 29 |