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Debt and lines of credit - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |
Commercial paper | $ 0 |  |  | $ 0 |
Proceeds from issuance of long-term debt |  |  |  | 1,498,000,000 | $ 743,000,000
Interest and debt expense | 48,000,000 |  | $ 44,000,000 | $ 93,000,000 | $ 82,000,000
Notes due 2020 at 1.75% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Retirement of debt | $ 500,000,000 |  |  |  |
Long-term debt stated interest rate (in percentage) | 1.75% |  |  | 1.75% |
Notes due 2025 at 1.375% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 750,000,000 |  |  |
Payments of debt issuance costs |  | 4,000,000 |  |  |
Proceeds from issuance of long-term debt |  | $ 749,000,000 |  |  |
Long-term debt stated interest rate (in percentage) | 1.375% |  |  | 1.375% |
Notes due 2030 at 1.75% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 750,000,000 |  |  | $ 750,000,000 |
Payments of debt issuance costs | 5,000,000 |  |  |  |
Proceeds from issuance of long-term debt | $ 749,000,000 |  |  |  |
Long-term debt stated interest rate (in percentage) | 1.75% |  |  | 1.75% |
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://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=119993939&loc=d3e28551-108399 Reference 2: 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 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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 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. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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