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Debt and lines of credit - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Commercial paper |  | $ 0 |  |  | $ 0 |
Proceeds from issuance of long-term debt |  |  |  |  | 1,491,000,000 | $ 1,500,000,000
Interest and debt expense |  | 43,000,000 |  | $ 36,000,000 | 125,000,000 | $ 89,000,000
Notes due 2019 at 1.65% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Retirement of debt | $ 750,000,000 |  |  |  |  |
Notes due 2039 at 3.875% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  |  | $ 750,000,000 |  |  |
Payments of debt issuance costs |  |  | 7,000,000 |  |  |
Proceeds from issuance of long-term debt |  |  | $ 743,000,000 |  |  |
Notes due 2029 at 2.25% |  |  |  |  |  |
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 |  | 748,000,000 |  |  |  |
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=6876686&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=119400593&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=6877327&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=114775744&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 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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