Restructuring Charges (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Restructuring Charges | |||
| Beginning Balance | $ 261 | $ 470 | $ 233 |
| Restructuring charges, net of revisions | 329 | (26) | 411 |
| Payments | (192) | (155) | (115) |
| Other non-cash | (15) | (28) | (59) |
| Ending Balance | 383 | 261 | 470 |
| Employee Severance [Member] | |||
| Restructuring Charges | |||
| Beginning Balance | 238 | 435 | 196 |
| Restructuring charges, net of revisions | 305 | (33) | 383 |
| Payments | (171) | (141) | (93) |
| Other non-cash | (12) | (23) | (51) |
| Ending Balance | 360 | 238 | 435 |
| Other Terminations [Member] | |||
| Restructuring Charges | |||
| Beginning Balance | 23 | 35 | 37 |
| Restructuring charges, net of revisions | 24 | 7 | 28 |
| Payments | (21) | (14) | (22) |
| Other non-cash | (3) | (5) | (8) |
| Ending Balance | $ 23 | 23 | $ 35 |
| GBT JV [Member] | |||
| Restructuring Charges | |||
| Other non-cash | (42) | ||
| Foreign exchange and other non-cash charges | |||
| Restructuring Charges | |||
| Other non-cash | $ (17) | ||