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DEBT - Narrative (Details) $ / shares in Units, € in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Apr. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Apr. 30, 2020 USD ($) day $ / shares | Aug. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2021 EUR (€) | Mar. 31, 2021 EUR (€) | Aug. 31, 2014 USD ($) | May 31, 2013 USD ($)
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 38,000,000 |  |  |  |  |
Loss on early extinguishment of debt | [1] |  |  |  |  |  | $ 0 | $ 0 | 242,000,000 | 0 |  |  |  |  |
Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated market value of outstanding debt |  | $ 12,300,000,000 |  |  |  |  | $ 12,300,000,000 |  | $ 12,300,000,000 |  | $ 14,000,000,000 |  |  |  |
Convertible Debt | 0.9% Convertible Senior Notes due September 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.90% |
Payments related to principal amount |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments related to conversion value in excess of the principal amount of senior notes |  | $ 86,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate at debt origination |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.18% |
Debt discount related to convertible notes, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 83,000,000 |
Debt discount related to convertible notes, before tax |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 143,000,000 |
Convertible Debt | 0.75% Convertible Senior Notes due May 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 863,000,000 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 0.75% |  |  | 0.75% |  | 0.75% |  | 0.75% |  | 0.75% | 0.75% |  |  |
Payments of debt issuance costs |  |  |  |  |  |  |  |  |  |  | $ 19,000,000 |  |  |  |
Conversion price | $ / shares |  |  |  |  | $ 1,886.44 |  |  |  |  |  |  |  |  |  |
Ratio of closing share price to conversion price as a condition for conversion of the convertible notes, minimum (Percentage) |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |
If-converted value in excess of principal |  |  |  |  |  |  |  |  | $ 215,000,000 |  |  |  |  |  |
Effective interest rate at debt origination |  |  |  |  | 4.10% |  |  |  |  |  |  |  |  |  |
Debt discount related to convertible notes, net of tax |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
Debt discount related to convertible notes, before tax |  |  |  |  | $ 130,000,000 |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 863,000,000 |  |  |  |  | $ 863,000,000 |  | 863,000,000 |  | 863,000,000 |  |  |  |
Convertible Debt | 0.35% Convertible Senior Notes due June 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.35%
Payments related to principal amount |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments related to conversion value in excess of the principal amount of senior notes |  |  |  | $ 245,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to redeem debt |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of long-term debt |  | $ 10,300,000,000 |  |  |  |  | $ 10,300,000,000 |  | $ 10,300,000,000 |  | $ 10,300,000,000 |  |  |  |
Senior Notes | 0.1% (€950 million) Senior Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  |  |  |  |  |  |  |  |  |  |  | € 950 |  |  |
Stated interest rate |  | 0.10% |  |  |  |  | 0.10% |  | 0.10% |  |  | 0.10% | 0.10% |  |
Effective interest rate at debt origination | [2] |  |  |  |  |  |  |  |  |  |  |  | 0.30% |  |
Aggregate principal amount |  | $ 1,101,000,000 |  |  |  |  | $ 1,101,000,000 |  | $ 1,101,000,000 |  |  |  | € 950 |  |
Senior Notes | 0.5% (€750 million) Senior Notes due March 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  |  |  |  |  |  |  |  |  |  |  | € 750 |  |  |
Stated interest rate |  | 0.50% |  |  |  |  | 0.50% |  | 0.50% |  |  | 0.50% | 0.50% |  |
Effective interest rate at debt origination | [2] |  |  |  |  |  |  |  |  |  |  |  | 0.63% |  |
Aggregate principal amount |  | $ 869,000,000 |  |  |  |  | $ 869,000,000 |  | $ 869,000,000 |  |  |  | € 750 |  |
Senior Notes | 4.1% Senior Notes due April 2025 and 4.5% Senior Notes due April 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | 242,000,000 |  |  |  |  |  |
Senior Notes | 4.1% Senior Notes due April 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 4.10% |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |
Payments to redeem debt |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 4.5% Senior Notes due April 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |
Payments to redeem debt |  |  | $ 868,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Euro-Denominated Debt | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of the portions of euro-denominated debt designated as a net investment hedge |  |  |  |  |  |  |  |  | 2,500,000,000 | 1,800,000,000 |  |  |  |  |
Minimum | Convertible Debt | 0.75% Convertible Senior Notes due May 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum and maximum consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | day |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |
Additional payment to debt holder, settled In shares, aggregate value |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Maximum | Euro-Denominated Debt | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of the portions of euro-denominated debt designated as a net investment hedge |  |  |  |  |  |  |  |  | 4,300,000,000 | $ 3,200,000,000 |  |  |  |  |
Maximum | Convertible Debt | 0.75% Convertible Senior Notes due May 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum and maximum consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | day |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |
Additional payment to debt holder, settled In shares, aggregate value |  |  |  |  | $ 235,000,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |
Revolving credit facility, term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Line of credit, current |  | 0 |  |  |  |  | 0 |  | 0 |  | 0 |  |  |  |
Debt instrument, covenant, minimum liquidity amount |  |  |  |  |  |  |  |  |  |  | 4,500,000,000 |  |  |  |
Debt instrument, covenant, pro forma liquidity required for distribution and share repurchases |  |  |  |  |  |  |  |  |  |  | 6,000,000,000 |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee rate |  |  |  |  |  | 0.07% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee rate |  |  |  |  |  | 0.20% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Rate 1 | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.875% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Rate 1 | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Rate 2B | Federal Funds Purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Rate 2C | One Month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Rate 2C | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Rate 2C | Minimum | One Month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Rate 2C | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |
Letters of credit issued |  | $ 4,000,000 |  |  |  |  | $ 4,000,000 |  | $ 4,000,000 |  | $ 4,000,000 |  |  |  |
Swingline Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
[1] | See Note 9 for additional information related to the loss on early extinguishment of debt.
[2] | Represents the coupon interest rate adjusted for deferred debt issuance costs, premiums or discounts existing at the origination of the debt.

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- Definition This element represents the estimated aggregate value of additional shares that the entity would be required to pay in the event that all or substantially all of the entity's common stock is acquired on or prior to the maturity of the specified convertible notes in a transaction in which the consideration paid to holders of the entity's common stock consists of all or substantially all cash. + References No definition available. + Details
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- Definition The value of the conversion premium on the convertible instrument paid in cash and booked to additional paid in capital. + References No definition available. + Details
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- Definition The carrying amount of the equity component of convertible debt related to debt discount, net of tax. + References No definition available. + Details
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- Definition Debt Instrument, Covenant, Minimum Liquidity Amount + References No definition available. + Details
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- Definition Debt Instrument, Covenant, Pro Forma Liquidity Required For Distribution + References No definition available. + Details
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- Definition Debt Instrument, Reference Rate + References No definition available. + Details
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- Definition The cash outflow from the repayment of the aggregate principal amount of convertible debt. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature. + References No definition available. + Details
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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