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Debt - Debt Repurchases and Conversions (Details) shares in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Nov. 16, 2017 USD ($) | Nov. 13, 2017 USD ($) | Aug. 31, 2017 USD ($) | Mar. 01, 2018 USD ($) | Nov. 30, 2017 USD ($) d shares | Dec. 01, 2016 USD ($)
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal |  |  |  |  |  | $ (2,360) |
Decrease in Cash |  |  |  |  |  | (2,744) | $ (188)
Gain (Loss) on debt repurchases and conversions |  |  |  |  |  | (195) | $ (2)
Unscheduled Settlement Activities |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal |  |  |  |  |  | (2,355) |
Increase (Decrease) in Carrying Value |  |  |  |  |  | (2,168) |
Decrease in Cash |  |  |  |  |  | (2,635) |
Decrease in Equity |  |  |  |  |  | (272) |
Secured Debt | 2023 Secured Notes |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal |  | $ (812) | $ (438) |  |  |  |
Percentage of Principal Amount Redeemable Using Equity Offering Proceeds |  |  | 35.00% |  |  |  |
Secured Debt | 2023 Secured Notes | Repurchases |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal | [1] |  |  |  |  | (1,250) |
Increase (Decrease) in Carrying Value | [1] |  |  |  |  | (1,238) |
Decrease in Cash | [1] |  |  |  |  | (1,373) |
Gain (Loss) on debt repurchases and conversions | [1] |  |  |  |  | (135) |
Corporate bonds | 2023 Notes | Repurchases |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal | [2] |  |  |  |  | (1,000) |
Increase (Decrease) in Carrying Value | [2] |  |  |  |  | (991) |
Decrease in Cash | [2] |  |  |  |  | (1,046) |
Gain (Loss) on debt repurchases and conversions | [2] |  |  |  |  | $ (55) |
Convertible Debt |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Derivative, Term of Contract, Consecutive Trading Days | d |  |  |  |  |  | 20 |
Convertible Debt | 2033E Notes |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Principal amount converted by holders |  |  |  |  |  | $ 50 |
Convertible Debt | 2033E Notes | 2033E Conversion Tranche 1 |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Cash |  |  |  |  |  | $ (92) |
Principal amount converted by holders |  |  |  | $ 58 |  |  |
Stock issued for conversion of 2033E Notes | shares |  |  |  |  |  | 3 |
Convertible Debt | 2033E Notes | 2033E Conversion Tranche 2 |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Cash |  |  |  |  |  | $ (20) |
Principal amount elected to be settled in cash and shares |  |  |  |  |  | $ 20 |
Stock issued for conversion of 2033E Notes | shares |  |  |  |  |  | 1 |
Convertible Debt | 2033E Notes | 2033E Conversion Tranche 3 |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal |  |  |  |  |  | $ (27) |
Decrease in Cash |  |  |  |  |  | (104) |
Principal amount elected to be settled in cash |  |  |  |  |  | 30 |
Convertible Debt | 2033E Notes | 2033E Conversion Tranche 3 | Scenario, Forecast |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal |  |  |  |  | $ (3) |  |
Convertible Debt | 2033E Notes | Conversions |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal | [3] |  |  |  |  | (105) |
Increase (Decrease) in Carrying Value | [3] |  |  |  |  | (125) |
Decrease in Cash | [3] |  |  |  |  | (216) |
Gain (Loss) on debt repurchases and conversions | [3] |  |  |  |  | (10) |
Decrease in Equity | [3] |  |  |  |  | (81) |
Convertible Debt | 2032C Notes |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Principal amount elected to be settled in cash |  |  |  |  |  | 51 |
Convertible Debt | 2032C Notes | Conversions |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Decrease in Principal | [4] |  |  |  |  | 0 |
Increase (Decrease) in Carrying Value | [4] |  |  |  |  | 186 |
Decrease in Cash | [4] |  |  |  |  | 0 |
Gain (Loss) on debt repurchases and conversions | [4] |  |  |  |  | 5 |
Decrease in Equity | [4] |  |  |  |  | $ (191) |
[1] | Redeemed $438 million of principal amount on November 13, 2017, which represented 35% of the original principal amount issued and was settled with proceeds from our common stock issuance in October 2017. Also redeemed the remaining $812 million of principal amount on November 16, 2017.
[2] | Redeemed on November 16, 2017.
[3] | In August 2017, holders converted an aggregate principal amount of $58 million, which were settled in the first quarter of 2018 for $92 million in cash and 3 million shares of our treasury stock. During the quarter ended November 30, 2017, holders converted an aggregate principal amount of $50 million. For converted notes with an aggregate principal amount of $20 million, we settled the principal amount of the conversion in the first quarter of 2018 with cash of $20 million and the remainder of the conversion amount was settled with 1 million shares of our treasury stock. For the remaining aggregate principal amount of $30 million of conversions in the first quarter of 2018, we elected to settle the conversion obligation in excess of the principal amount in cash. We paid $104 million in the first quarter of 2018 to settle obligations for $27 million of the aggregate principal amount and obligations for the remaining $3 million in principal will settle in the second quarter of 2018.
[4] | Holders converted an aggregate principal amount of $51 million and we elected to settle the conversion obligation in excess of the principal amount in cash. As a result, the carrying amount as of November 30, 2017 increased for the fair values of the derivative debt liability. The conversion of these notes will settle in the second quarter of 2018.

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