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Debt and lines of credit - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2021 USD ($) | Sep. 30, 2021 USD ($) seriesOfDebt | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) seriesOfDebt | Sep. 30, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Commercial paper |  | $ 0 |  | $ 0 |
Retirement of debt |  |  |  | 550,000,000 | $ 500,000,000
Interest and debt expense |  | $ 45,000,000 | $ 49,000,000 | $ 135,000,000 | $ 142,000,000
Senior unsecured notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of series of debt issued | seriesOfDebt |  | 3 |  | 3 |
Principal amount |  | $ 1,500,000,000 |  | $ 1,500,000,000 |
Debt issuance costs |  | 10,000,000 |  | 10,000,000 |
Notes due 2026 at 1.125% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 500,000,000 |  | $ 500,000,000 |
Long-term debt stated interest rate (in percentage) |  | 1.125% |  | 1.125% |
Notes due 2031 at 1.90% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 500,000,000 |  | $ 500,000,000 |
Long-term debt stated interest rate (in percentage) |  | 1.90% |  | 1.90% |
Notes due 2051 at 2.70% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 500,000,000 |  | $ 500,000,000 |
Long-term debt stated interest rate (in percentage) |  | 2.70% |  | 2.70% |
Notes due 2021 at 2.75% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  | 2.75% |  | 2.75% |
Retirement of debt | $ 550,000,000 |  |  |  |
Revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 2,000,000,000 |  | $ 2,000,000,000 |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: 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(13)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 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(a)(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(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 (b) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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