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Debt - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Aug. 31, 2020 USD ($) $ / shares shares | Jul. 31, 2020 USD ($) tranche | Jun. 30, 2020 USD ($) tranche | Apr. 30, 2020 USD ($) shares $ / shares | Feb. 29, 2020 USD ($) | Aug. 31, 2020 USD ($) $ / shares | Aug. 31, 2020 USD ($) day shares $ / shares | Aug. 31, 2019 USD ($) | Oct. 08, 2020 USD ($) creditFacility | Sep. 30, 2020 USD ($) | Jul. 31, 2020 EUR (€) tranche | Jun. 30, 2020 EUR (€) tranche | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current unsecured debt | $ 3,000,000,000.0 |  |  |  |  | $ 3,000,000,000.0 | $ 3,000,000,000.0 |  |  |  |  |  |
Proceeds from short term debt |  |  |  |  |  |  | 525,000,000 |  |  |  |  |  |
Repayments of short term debt |  |  |  |  |  |  | 192,000,000 |  |  |  |  |  |
Long-term debt | $ 22,532,000,000 |  |  |  |  | 22,532,000,000 | 22,532,000,000 |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ (224,000,000) | $ 0 |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  |  |  |  |  | 3.0 |  |  |  |  |  |
Senior Notes 3.95% due in 2020 and Senior Notes 1.625% due in 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Senior Notes 3.95% due in 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (percent) | 4.00% |  |  |  |  | 4.00% | 4.00% |  |  |  |  |  |
Repurchase amount | $ 86,000,000 |  |  |  |  | $ 86,000,000 | $ 86,000,000 |  |  |  |  |  |
Debt instrument, repurchased face amount | $ 700,000,000 |  |  |  |  | $ 700,000,000 | $ 700,000,000 |  |  |  |  |  |
Senior Notes 1.625% due in 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (percent) | 1.60% |  |  |  |  | 1.60% | 1.60% |  |  |  |  |  |
Repurchase amount | $ 123,000,000 |  |  |  |  | $ 123,000,000 | $ 123,000,000 |  |  |  |  |  |
Debt instrument, repurchased face amount | 555,000,000 |  |  |  |  | 555,000,000 | 555,000,000 |  |  |  |  |  |
Export credit facilities with Financial Covenant waivers | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  |
Number of export credit facilities | creditFacility |  |  |  |  |  |  |  |  | 3 |  |  |  |
Export credit facility | Export credit facility due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 823,000,000
Export credit facility | Export credit facility due 2033 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 610,000,000 |  |  |
Sterling-denominated floating rate bank loan | Sterling-denominated floating rate bank loan due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term debt |  |  |  |  | $ 452,000,000 |  |  |  |  |  |  |  |
Euro-denominated fixed rate bank loan | Euro-denominated fixed rate bank loan due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term debt |  |  |  | $ 166,000,000 |  |  |  |  |  |  |  |  |
Euro-denominated fixed rate bank loan | Euro-denominated fixed rate bank loan due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term debt |  | $ 337,000,000 |  |  |  |  |  |  |  |  |  |  |
Secured | Senior Secured Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 4,000,000,000.0 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (percent) |  |  |  | 11.50% |  |  |  |  |  |  |  |  |
Long-term debt | 27,900,000,000 |  |  |  |  | 27,900,000,000 | $ 27,900,000,000 |  |  |  |  |  |
Secured | Senior Secured Notes due 2023 | Maximum | On or After January 1, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage (less than 98%) |  |  |  |  |  |  | 101.00% |  |  |  |  |  |
Secured | Senior Secured Term Loan Facility due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 2,800,000,000 |  |  |  |  |  |  |  |  |  |
Number of tranches | tranche |  |  | 2 |  |  |  |  |  |  |  |  | 2 |
Secured | Senior Secured Term Loan Facility due 2025, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 1,900,000,000 |  |  |  |  |  |  |  |  |  |
Secured | Senior Secured Term Loan Facility due 2025, Tranche One | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, floor rate on variable rate (percentage) |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Debt instrument, variable rate (percentage) |  |  | 7.50% |  |  |  |  |  |  |  |  |  |
Secured | Senior Secured Term Loan Facility due 2025, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  |  | € 800,000,000 |
Secured | Senior Secured Term Loan Facility due 2025, Tranche Two | Eurodollar |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, floor rate on variable rate (percentage) |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Debt instrument, variable rate (percentage) |  |  | 7.50% |  |  |  |  |  |  |  |  |  |
Secured | Senior Secured Term Loan Facility due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of tranches | tranche |  | 2 |  |  |  |  |  |  |  |  | 2 |  |
Secured | Senior Secured Term Loan Facility due 2026, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 775,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (percent) |  | 10.50% |  |  |  |  |  |  |  |  | 10.50% |  |
Secured | Senior Secured Term Loan Facility due 2026, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  | € 425,000,000 |  |
Debt instrument, interest rate (percent) |  | 10.10% |  |  |  |  |  |  |  |  | 10.10% |  |
Secured | Senior Secured Term Loan Facility due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 900,000,000 |  |  |  |  | $ 900,000,000 | $ 900,000,000 |  |  |  |  |  |
Debt instrument, interest rate (percent) | 9.90% |  |  |  |  | 9.90% | 9.90% |  |  |  |  |  |
Convertible | Senior Convertible Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (percent) |  |  |  | 5.75% |  |  |  |  |  |  |  |  |
Long-term debt | $ 954,000,000 |  |  |  |  | $ 954,000,000 | $ 954,000,000 |  |  |  |  |  |
Debt instrument, convertible, number of shares | shares |  |  |  | 100 |  |  |  |  |  |  |  |  |
Conversion rate, amount |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Debt instrument, conversion price (in dollars per share) | $ / shares |  |  |  | $ 10 |  |  |  |  |  |  |  |  |
Repurchase amount | 886,000,000 |  |  |  |  | 886,000,000 | 886,000,000 |  |  |  |  |  |
Loss on extinguishment of debt | (224,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, carrying amount | 286,000,000 |  |  |  |  | 286,000,000 | 286,000,000 |  |  |  |  |  |
Debt instrument, convertible, carrying amount, after partial repurchase | $ 0 |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |
Debt instrument, effective interest rate (percentage) | 12.90% |  |  |  |  | 12.90% | 12.90% |  |  |  |  |  |
Convertible | Senior Convertible Notes due 2023 | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares | 99,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares | $ 14.02 |  |  |  |  | $ 14.02 | $ 14.02 |  |  |  |  |  |
Convertible | Senior Convertible Notes due 2023 | Measurement Period |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate, amount |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Convertible threshold trading days | day |  |  |  |  |  |  | 5 |  |  |  |  |  |
Convertible threshold consecutive trading days | day |  |  |  |  |  |  | 5 |  |  |  |  |  |
Convertible | Senior Convertible Notes due 2023 | On or After January 1, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage (less than 98%) |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Debt instrument, convertible, number of shares | shares |  |  |  |  |  |  | 100 |  |  |  |  |  |
Conversion rate, amount |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Convertible | Senior Convertible Notes due 2023 | Minimum | Before January 1, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage (less than 98%) |  |  |  |  |  |  | 130.00% |  |  |  |  |  |
Convertible threshold trading days | day |  |  |  |  |  |  | 20 |  |  |  |  |  |
Convertible threshold consecutive trading days | day |  |  |  |  |  |  | 30 |  |  |  |  |  |
Convertible | Senior Convertible Notes due 2023 | Minimum | Measurement Period |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage (less than 98%) |  |  |  |  |  |  | 98.00% |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current unsecured debt | $ 314,000,000 |  |  |  |  | $ 314,000,000 | $ 314,000,000 |  |  |  |  |  |
Euro-denominated commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current unsecured debt | 20,000,000 |  |  |  |  | 20,000,000 | 20,000,000 |  |  |  |  |  |
Sterling-denominated commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current unsecured debt | $ 33,000,000 |  |  |  |  | $ 33,000,000 | $ 33,000,000 |  |  |  |  |  |

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