Restructuring Charges (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Dec. 31, 2014 |
Jun. 30, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Type of Restructuring [Domain] | |||||
| Restructuring Charges | |||||
| Beginning Balance | $ 470 | $ 233 | $ 470 | ||
| Restructuring charges, net of revisions | $ 313 | $ 133 | (26) | 411 | (4) |
| Payments | (155) | (115) | (229) | ||
| Other non-cash | (28) | (59) | (4) | ||
| Ending Balance | 470 | 261 | 470 | 233 | |
| Employee Severance [Member] | |||||
| Restructuring Charges | |||||
| Beginning Balance | 435 | 196 | 412 | ||
| Restructuring charges, net of revisions | (33) | 383 | (7) | ||
| Payments | (141) | (93) | (206) | ||
| Other non-cash | (23) | (51) | (3) | ||
| Ending Balance | 435 | 238 | 435 | 196 | |
| Other Terminations [Member] | |||||
| Restructuring Charges | |||||
| Beginning Balance | 35 | 37 | 58 | ||
| Restructuring charges, net of revisions | 7 | 28 | 3 | ||
| Payments | (14) | (22) | (23) | ||
| Other non-cash | (5) | (8) | (1) | ||
| Ending Balance | $ 35 | $ 23 | 35 | $ 37 | |
| GBT JV [Member] | |||||
| Restructuring Charges | |||||
| Other non-cash | (42) | ||||
| Foreign exchange and other non-cash charges | |||||
| Restructuring Charges | |||||
| Other non-cash | $ (17) | ||||