Retirement Benefits Plans Retirement Benefits Plans - Employer Contributions to Retirement Benefits Plans (Details 9) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| United States pension plans [Member] | |||
| Defined Benefit Plans and Other Postretirement Benefit Plans | |||
| Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | $ 59 | ||
| Employer contributions to pension plans | 221 | $ 248 | $ 196 |
| Non-United States pension plans [Member] | |||
| Defined Benefit Plans and Other Postretirement Benefit Plans | |||
| Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 103 | ||
| Employer contributions to pension plans | 109 | 114 | 145 |
| Total contributions [Member] | |||
| Defined Benefit Plans and Other Postretirement Benefit Plans | |||
| Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 162 | ||
| Employer contributions to pension plans | $ 330 | $ 362 | $ 341 |