BASIS OF PRESENTATION - Intangible Assets Summary (Details) - USD ($) $ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Other intangible assets | ||
| Gross Carrying Amount | $ 2,712 | $ 2,649 |
| Accumulated Amortization | (920) | (883) |
| Net Book Value | 1,792 | 1,766 |
| Capitalized software costs | ||
| Other intangible assets | ||
| Gross Carrying Amount | 1,644 | 1,582 |
| Accumulated Amortization | (784) | (754) |
| Net Book Value | 860 | 828 |
| Trade names | ||
| Other intangible assets | ||
| Gross Carrying Amount | 102 | 102 |
| Accumulated Amortization | 0 | 0 |
| Net Book Value | 102 | 102 |
| Contracts | ||
| Other intangible assets | ||
| Gross Carrying Amount | 860 | 859 |
| Accumulated Amortization | (64) | (60) |
| Net Book Value | 796 | 799 |
| Other | ||
| Other intangible assets | ||
| Gross Carrying Amount | 106 | 106 |
| Accumulated Amortization | (72) | (69) |
| Net Book Value | $ 34 | $ 37 |