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DEBT - Debt Extinguishment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instruments [Line Items] |  |  |
Gain (Loss) on Extinguishment of Debt | $ (101) | $ (27) | $ 7
Senior Notes [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 2,598 | 2,145 | 454
DebtIssuanceCostsandFairValueAdjustments | (12) | 30 | 26
Extinguishment of Debt, Amount | 2,586 | 2,175 | 480
Extinguishment Of Debt, Redemption Value | 2,686 | 2,201 | 470
Gain (Loss) on Extinguishment of Debt | 100 | 26 | (10)
Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 404
DebtIssuanceCostsandFairValueAdjustments |  |  | 22
Extinguishment of Debt, Amount |  |  | 426
Extinguishment Of Debt, Redemption Value |  |  | 418
Gain (Loss) on Extinguishment of Debt |  |  | (8)
Senior Notes [Member] | 3.55% Senior Notes Due 2022 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 1,356 | 12 |
DebtIssuanceCostsandFairValueAdjustments | (6) | 0 |
Extinguishment of Debt, Amount | 1,350 | 12 |
Extinguishment Of Debt, Redemption Value | 1,391 | 12 |
Gain (Loss) on Extinguishment of Debt | 41 | 0 |
Senior Notes [Member] | 3.875% Senior Notes due March 2023 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 927 |  |
DebtIssuanceCostsandFairValueAdjustments | (4) |  |
Extinguishment of Debt, Amount | 923 |  |
Extinguishment Of Debt, Redemption Value | 964 |  |
Gain (Loss) on Extinguishment of Debt | 41 |  |
Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  | 728 | 50
DebtIssuanceCostsandFairValueAdjustments |  | 34 | 4
Extinguishment of Debt, Amount |  | 762 | 54
Extinguishment Of Debt, Redemption Value |  | 768 | 52
Gain (Loss) on Extinguishment of Debt |  | 6 | $ (2)
Senior Notes [Member] | 4.00% Senior Notes Due 2021 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 195 | 405 |
DebtIssuanceCostsandFairValueAdjustments | (1) | (2) |
Extinguishment of Debt, Amount | 194 | 403 |
Extinguishment Of Debt, Redemption Value | 205 | 418 |
Gain (Loss) on Extinguishment of Debt | 11 | 15 |
Senior Notes [Member] | senior notes 4.55 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 120 |  |
DebtIssuanceCostsandFairValueAdjustments | (1) |  |
Extinguishment of Debt, Amount | 119 |  |
Extinguishment Of Debt, Redemption Value | 126 |  |
Gain (Loss) on Extinguishment of Debt | $ 7 |  |
Senior Notes [Member] | Senior Notes Due 2022, 3.1% [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  | 1,000 |
DebtIssuanceCostsandFairValueAdjustments |  | (2) |
Extinguishment of Debt, Amount |  | 998 |
Extinguishment Of Debt, Redemption Value |  | 1,003 |
Gain (Loss) on Extinguishment of Debt |  | $ 5 |

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