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Debt (Settled) (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 18, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Debt |  |  |
Aggregate net gain (loss) |  | $ (57) | $ (18)
9.00% Senior Notes due July 2023 |  |  |
Debt |  |  |
Aggregate debt repurchase |  | 200 |
Aggregate cash payment | $ 767 |  |
Aggregate net gain (loss) |  | (65) |
6.50% Senior Notes due November 2020 |  |  |
Debt |  |  |
Aggregate principal amount repaid |  | 8 |
Aggregate debt repurchase |  | 57 |
6.375% Senior Notes due December 2021 |  |  |
Debt |  |  |
Aggregate principal amount repaid |  | 38 |
Aggregate debt repurchase |  | 63 |
3.80% Senior Notes due October 2022 |  |  |
Debt |  |  |
Aggregate principal amount repaid |  | 3 |
Aggregate debt repurchase |  | 190 |
5.375% Senior Secured Notes due May 2023 |  |  |
Debt |  |  |
Aggregate principal amount repaid |  | 6 |
Debt Repurchases |  |  |
Debt |  |  |
Aggregate principal amount repaid |  | 55 |
Aggregate cash payment |  | 46 |
Aggregate net gain (loss) |  | 8 |
Tendered Notes |  |  |
Debt |  |  |
Aggregate debt repurchase |  | 510 |
Aggregate cash payment |  | 522 |
Aggregate net gain (loss) |  | $ (18) |

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