Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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

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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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Percentage of principal amount of debt redeemed.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Debt - Senior Notes (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
Debt - Senior Notes (Details) - USD ($)	Mar. 01, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	May 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Debt Instrument [Line Items]
Principal amount			$ 9,105,000,000		$ 9,105,000,000			$ 7,750,000,000
Loss on extinguishment of debt					$ 10,000,000	$ 0
Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount							$ 2,500,000,000
Redemption price, percentage					101.00%
Interest expense			66,000,000	$ 67,000,000	$ 191,000,000	$ 211,000,000
Fair value of long-term debt			$ 9,600,000,000		$ 9,600,000,000			8,300,000,000
Senior Notes \| 6.000% Senior notes due 2056
Debt Instrument [Line Items]
Interest rate			6.00%		6.00%
Principal amount			$ 0		$ 0			750,000,000
Senior Notes \| 2.600% Senior notes due 2022
Debt Instrument [Line Items]
Interest rate			2.60%		2.60%
Principal amount			$ 605,000,000		$ 605,000,000			1,000,000,000
Senior Notes \| 1.400% Senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, face amount							$ 750,000,000
Interest rate			1.40%		1.40%		1.40%
Principal amount			$ 750,000,000		$ 750,000,000			0
Senior Notes \| 2.600% Senior notes due 2031
Debt Instrument [Line Items]
Debt instrument, face amount							$ 750,000,000
Interest rate			2.60%		2.60%		2.60%
Principal amount			$ 750,000,000		$ 750,000,000			0
Senior Notes \| 3.650% Senior notes due 2051
Debt Instrument [Line Items]
Debt instrument, face amount							$ 1,000,000,000
Interest rate			3.65%		3.65%		3.65%
Principal amount			$ 1,000,000,000		$ 1,000,000,000			0
Senior Notes \| 3.800% Senior notes due 2022
Debt Instrument [Line Items]
Interest rate			3.80%		3.80%
Principal amount			$ 750,000,000		$ 750,000,000			750,000,000
Senior Notes \| 2.750% Senior notes due 2023
Debt Instrument [Line Items]
Interest rate			2.75%		2.75%
Principal amount			$ 750,000,000		$ 750,000,000			750,000,000
Senior Notes \| 1.900% Senior notes due 2025
Debt Instrument [Line Items]
Interest rate			1.90%		1.90%
Principal amount			$ 800,000,000		$ 800,000,000			800,000,000
Senior Notes \| 3.600% Senior notes due 2027
Debt Instrument [Line Items]
Interest rate			3.60%		3.60%
Principal amount			$ 850,000,000		$ 850,000,000			850,000,000
Senior Notes \| 2.700% Senior notes due 2030
Debt Instrument [Line Items]
Interest rate			2.70%		2.70%
Principal amount			$ 950,000,000		$ 950,000,000			$ 950,000,000
Convertible Debt \| LIBOR-based floating rate debt
Debt Instrument [Line Items]
Debt instrument, face amount									$ 400,000,000
Senior Notes \| 6.000% Senior notes due 2056
Debt Instrument [Line Items]
Debt instrument, face amount	$ 750,000,000
Interest rate	6.00%
Debt repaid	$ 750,000,000
Redemption price, percentage	100.00%
Senior Notes \| 2.600% Senior notes due 2022
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,000,000,000
Interest rate		2.60%
Debt repaid		$ 405,000,000
Percentage of principal amount redeemed		39.00%
Principal amount		$ 395,000,000
Loss on extinguishment of debt		$ 10,000,000