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EMPLOYEE RETIREMENT PLANS - Qualified Defined-benefit Pension Plan Assets at Fair Value by Level within the Fair Value Hierarchy (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | $ 19,000,000 | $ 93,000,000 |
Qualified |  |  |
Fair Value |  |  |
Private equity funds | 780,000,000 | 670,000,000 | $ 695,000,000
Valued at NAV | 464,000,000 | 376,000,000 |
Fair Value, Inputs, Level 1 | Qualified |  |  |
Fair Value |  |  |
Private equity funds | 239,000,000 | 184,000,000 |
Fair Value, Inputs, Level 2 | Qualified |  |  |
Fair Value |  |  |
Private equity funds | 58,000,000 | 51,000,000 |
Fair Value, Inputs, Level 3 | Qualified |  |  |
Fair Value |  |  |
Private equity funds | 19,000,000 | 59,000,000 |
UNITED STATES | Qualified | Common And Preferred Stock [Member] |  |  |
Fair Value |  |  |
Private equity funds | 167,000,000 | 102,000,000 |
Valued at NAV | 82,000,000 | 21,000,000 |
UNITED STATES | Qualified | Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | 2,000,000 | 32,000,000 |
Valued at NAV | 0 | 0 |
UNITED STATES | Qualified | Corporate Debt Securities [Member] |  |  |
Fair Value |  |  |
Private equity funds | 198,000,000 | 136,000,000 |
Valued at NAV | 124,000,000 | 102,000,000 |
UNITED STATES | Qualified | US Treasury and Government [Member] |  |  |
Fair Value |  |  |
Private equity funds | 151,000,000 | 132,000,000 |
Valued at NAV | 148,000,000 | 130,000,000 |
UNITED STATES | Qualified | Common Collective Trust Fund [Member] |  |  |
Fair Value |  |  |
Private equity funds | 4,000,000 | 4,000,000 |
Valued at NAV | 0 | 0 |
UNITED STATES | Qualified | Short Term And Other Investments [Member] |  |  |
Fair Value |  |  |
Private equity funds | 2,000,000 | 1,000,000 |
Valued at NAV | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 1 | Qualified | Common And Preferred Stock [Member] |  |  |
Fair Value |  |  |
Private equity funds | 85,000,000 | 81,000,000 |
UNITED STATES | Fair Value, Inputs, Level 1 | Qualified | Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 1 | Qualified | Corporate Debt Securities [Member] |  |  |
Fair Value |  |  |
Private equity funds | 74,000,000 | 34,000,000 |
UNITED STATES | Fair Value, Inputs, Level 1 | Qualified | US Treasury and Government [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 1 | Qualified | Common Collective Trust Fund [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 1 | Qualified | Short Term And Other Investments [Member] |  |  |
Fair Value |  |  |
Private equity funds | 2,000,000 | 1,000,000 |
UNITED STATES | Fair Value, Inputs, Level 2 | Qualified | Common And Preferred Stock [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 2 | Qualified | Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 2 | Qualified | Corporate Debt Securities [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 2 | Qualified | US Treasury and Government [Member] |  |  |
Fair Value |  |  |
Private equity funds | 3,000,000 | 2,000,000 |
UNITED STATES | Fair Value, Inputs, Level 2 | Qualified | Common Collective Trust Fund [Member] |  |  |
Fair Value |  |  |
Private equity funds | 4,000,000 | 4,000,000 |
UNITED STATES | Fair Value, Inputs, Level 2 | Qualified | Short Term And Other Investments [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Qualified | Common And Preferred Stock [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Qualified | Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | 2,000,000 | 32,000,000 |
UNITED STATES | Fair Value, Inputs, Level 3 | Qualified | Corporate Debt Securities [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Qualified | US Treasury and Government [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Qualified | Common Collective Trust Fund [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
UNITED STATES | Fair Value, Inputs, Level 3 | Qualified | Short Term And Other Investments [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Qualified | Common And Preferred Stock [Member] |  |  |
Fair Value |  |  |
Private equity funds | 157,000,000 | 126,000,000 |
Valued at NAV | 110,000,000 | 89,000,000 |
Foreign Plan [Member] | Qualified | Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | 17,000,000 | 61,000,000 |
Valued at NAV | 0 | 34,000,000 |
Foreign Plan [Member] | Qualified | Corporate Debt Securities [Member] |  |  |
Fair Value |  |  |
Private equity funds | 1,000,000 | 1,000,000 |
Valued at NAV | 0 | 0 |
Foreign Plan [Member] | Qualified | Debt Security, Government, Non-US [Member] |  |  |
Fair Value |  |  |
Private equity funds | 67,000,000 | 62,000,000 |
Valued at NAV | 0 | 0 |
Foreign Plan [Member] | Qualified | Buy-in Annuity [Member] |  |  |
Fair Value |  |  |
Private equity funds | 12,000,000 | 11,000,000 |
Valued at NAV | 0 | 0 |
Foreign Plan [Member] | Qualified | Short Term And Other Investments [Member] |  |  |
Fair Value |  |  |
Private equity funds | 2,000,000 | 2,000,000 |
Valued at NAV | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 1 | Qualified | Common And Preferred Stock [Member] |  |  |
Fair Value |  |  |
Private equity funds | 47,000,000 | 37,000,000 |
Foreign Plan [Member] | Fair Value, Inputs, Level 1 | Qualified | Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 1 | Qualified | Corporate Debt Securities [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 1 | Qualified | Debt Security, Government, Non-US [Member] |  |  |
Fair Value |  |  |
Private equity funds | 29,000,000 | 29,000,000 |
Foreign Plan [Member] | Fair Value, Inputs, Level 1 | Qualified | Buy-in Annuity [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 1 | Qualified | Short Term And Other Investments [Member] |  |  |
Fair Value |  |  |
Private equity funds | 2,000,000 | 2,000,000 |
Foreign Plan [Member] | Fair Value, Inputs, Level 2 | Qualified | Common And Preferred Stock [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 2 | Qualified | Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 2 | Qualified | Corporate Debt Securities [Member] |  |  |
Fair Value |  |  |
Private equity funds | 1,000,000 | 1,000,000 |
Foreign Plan [Member] | Fair Value, Inputs, Level 2 | Qualified | Debt Security, Government, Non-US [Member] |  |  |
Fair Value |  |  |
Private equity funds | 38,000,000 | 33,000,000 |
Foreign Plan [Member] | Fair Value, Inputs, Level 2 | Qualified | Buy-in Annuity [Member] |  |  |
Fair Value |  |  |
Private equity funds | 12,000,000 | 11,000,000 |
Foreign Plan [Member] | Fair Value, Inputs, Level 2 | Qualified | Short Term And Other Investments [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 3 | Qualified | Common And Preferred Stock [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 3 | Qualified | Private Equity And Hedge Funds [Member] |  |  |
Fair Value |  |  |
Private equity funds | 17,000,000 | 27,000,000 |
Foreign Plan [Member] | Fair Value, Inputs, Level 3 | Qualified | Corporate Debt Securities [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 3 | Qualified | Debt Security, Government, Non-US [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 3 | Qualified | Buy-in Annuity [Member] |  |  |
Fair Value |  |  |
Private equity funds | 0 | 0 |
Foreign Plan [Member] | Fair Value, Inputs, Level 3 | Qualified | Short Term And Other Investments [Member] |  |  |
Fair Value |  |  |
Private equity funds | $ 0 | $ 0 |

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