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EMPLOYEE RETIREMENT PLANS - Qualified Defined-benefit Pension Plan Assets at Fair Value by Level within the Fair Value Hierarchy (Details) - Qualified - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Fair Value |  |  |
Private equity funds | $ 695 | $ 717 | $ 658
Total asset at net asset value | 259 | 185 |
UNITED STATES | Common and Preferred Stocks |  |  |
Fair Value |  |  |
Private equity funds | 191 | 260 |
Total asset at net asset value | 47 | 118 |
UNITED STATES | Private Equity and Hedge Funds |  |  |
Fair Value |  |  |
Private equity funds | 36 | 37 |
Total asset at net asset value |  | 0 |
UNITED STATES | Corporate Debt Securities |  |  |
Fair Value |  |  |
Private equity funds | 57 | 57 |
Total asset at net asset value | 0 | 2 |
UNITED STATES | US Treasury and Government |  |  |
Fair Value |  |  |
Private equity funds | 53 | 50 |
Total asset at net asset value | 31 |  |
UNITED STATES | Common Collective Trust Fund |  |  |
Fair Value |  |  |
Private equity funds | 6 | 4 |
UNITED STATES | Short-Term and other Investments |  |  |
Fair Value |  |  |
Private equity funds | 2 | 2 |
International | Common and Preferred Stocks |  |  |
Fair Value |  |  |
Private equity funds | 191 | 90 |
Total asset at net asset value | 125 | 16 |
International | Private Equity and Hedge Funds |  |  |
Fair Value |  |  |
Private equity funds | 59 | 56 |
Total asset at net asset value | 35 | 32 |
International | Corporate Debt Securities |  |  |
Fair Value |  |  |
Private equity funds | 28 | 43 |
Total asset at net asset value | 21 | 17 |
International | Government and Other Debt Securities |  |  |
Fair Value |  |  |
Private equity funds | 59 | 80 |
International | Buy-in Annuity |  |  |
Fair Value |  |  |
Private equity funds | 12 |  |
International | Short-Term and other Investments |  |  |
Fair Value |  |  |
Private equity funds | 1 | 38 |
Level 1 |  |  |
Fair Value |  |  |
Private equity funds | 289 | 323 |
Level 1 | UNITED STATES | Common and Preferred Stocks |  |  |
Fair Value |  |  |
Private equity funds | 144 | 142 |
Level 1 | UNITED STATES | Corporate Debt Securities |  |  |
Fair Value |  |  |
Private equity funds | 31 | 27 |
Level 1 | UNITED STATES | US Treasury and Government |  |  |
Fair Value |  |  |
Private equity funds | 15 | 46 |
Level 1 | UNITED STATES | Short-Term and other Investments |  |  |
Fair Value |  |  |
Private equity funds | 2 | 2 |
Level 1 | International | Common and Preferred Stocks |  |  |
Fair Value |  |  |
Private equity funds | 66 | 74 |
Level 1 | International | Government and Other Debt Securities |  |  |
Fair Value |  |  |
Private equity funds | 31 | 27 |
Level 1 | International | Short-Term and other Investments |  |  |
Fair Value |  |  |
Private equity funds |  | 5 |
Level 2 |  |  |
Fair Value |  |  |
Private equity funds | 87 | 130 |
Level 2 | UNITED STATES | Common and Preferred Stocks |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
Level 2 | UNITED STATES | Corporate Debt Securities |  |  |
Fair Value |  |  |
Private equity funds | 26 | 28 |
Level 2 | UNITED STATES | US Treasury and Government |  |  |
Fair Value |  |  |
Private equity funds | 7 | 4 |
Level 2 | UNITED STATES | Common Collective Trust Fund |  |  |
Fair Value |  |  |
Private equity funds | 6 | 4 |
Level 2 | International | Common and Preferred Stocks |  |  |
Fair Value |  |  |
Private equity funds |  | 0 |
Level 2 | International | Corporate Debt Securities |  |  |
Fair Value |  |  |
Private equity funds | 7 | 26 |
Level 2 | International | Government and Other Debt Securities |  |  |
Fair Value |  |  |
Private equity funds | 28 | 53 |
Level 2 | International | Buy-in Annuity |  |  |
Fair Value |  |  |
Private equity funds | 12 |  |
Level 2 | International | Short-Term and other Investments |  |  |
Fair Value |  |  |
Private equity funds | 1 | 15 |
Level 3 |  |  |
Fair Value |  |  |
Private equity funds | 60 | 79 |
Level 3 | UNITED STATES | Private Equity and Hedge Funds |  |  |
Fair Value |  |  |
Private equity funds | 36 | 37 |
Level 3 | International | Private Equity and Hedge Funds |  |  |
Fair Value |  |  |
Private equity funds | $ 24 | 24 |
Level 3 | International | Short-Term and other Investments |  |  |
Fair Value |  |  |
Private equity funds |  | $ 18 |

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