Convertible Debt, Conversion Terms, Measurement Period Trading Price Threshold Percentage

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Convertible Debt, Conversion Terms, Percentage Of Sales Price Exceeding Conversion Price

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Debt Instrument, Percent Of Holders Can Declare Debt Due And Payable

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Debt Instrument, Unamortized Discount, Expected Amortization, Year Five

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Debt Instrument, Unamortized Discount, Expected Amortization, Year Four

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Debt Instrument, Unamortized Discount, Expected Amortization, Year One

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Debt Instrument, Unamortized Discount, Expected Amortization, Year Three

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Debt Instrument, Unamortized Discount, Expected Amortization, Year Two

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Long Term Debt, Price, Percentage Of Par Value

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt discount.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Debt - 6.50% Convertible Senior Notes (Details)	1 Months Ended	12 Months Ended
Debt - 6.50% Convertible Senior Notes (Details)	Jun. 30, 2020 USD ($) $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2021 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		$ 11,780,000,000	$ 3,960,000,000	$ 2,354,000,000
Effective interest rate percentage		20.00%
Interest expense		$ 1,227,000,000	$ 1,095,000,000	$ 1,056,000,000
Senior Notes 6.50% Due 2025 \| Senior Notes
Debt Instrument [Line Items]
Fixed interest rate per annum	6.50%
Principal amount of 6.50% convertible senior notes	$ 1,000,000,000.0	1,000,000,000
Proceeds from issuance of long-term debt	$ 970,000,000
Long term debt, price, percentage of par value	100.00%
Debt instrument, conversion ratio	0.0617284
Conversion price \| $ / shares	$ 16.20
Convertible debt, conversion terms, percentage of sales price exceeding conversion price	130.00%
Convertible debt, conversion terms, measurement period trading price threshold percentage	98.00%
Redemption price percentage	100.00%
Debt instrument, percent of holders can declare debt due and payable	25.00%
Interest expense		61,000,000
Amortization of debt discount		28,000,000
Interest expense		33,000,000
Debt instrument, unamortized discount, expected amortization, year one		63,000,000
Debt instrument, unamortized discount, expected amortization, year two		77,000,000
Debt instrument, unamortized discount, expected amortization, year three		95,000,000
Debt instrument, unamortized discount, expected amortization, year four		116,000,000
Debt instrument, unamortized discount, expected amortization, year five		66,000,000
Senior Notes 6.50% Due 2025 \| Senior Notes \| Cumulative Effect, Period of Adoption, Adjustment \| Subsequent Event
Debt Instrument [Line Items]
Reduction of debt discount					$ 389,000,000
Senior Notes 6.50% Due 2025 \| Senior Notes \| Cumulative Effect, Period of Adoption, Adjusted Balance
Debt Instrument [Line Items]
Debt instrument, unamortized discount, expected amortization, year one		5,000,000
Debt instrument, unamortized discount, expected amortization, year two		6,000,000
Debt instrument, unamortized discount, expected amortization, year three		6,000,000
Debt instrument, unamortized discount, expected amortization, year four		7,000,000
Debt instrument, unamortized discount, expected amortization, year five		$ 4,000,000