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Debt and Lines of Credit - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Aug. 31, 2019 | May 31, 2018 | Mar. 31, 2019 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  | $ 0 |  |
Debt repaid |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 1,498,000,000 | $ 1,491,000,000 | $ 1,500,000,000
Interest and debt expense |  |  |  |  |  |  |  |  | 190,000,000 | 170,000,000 | 125,000,000
Interest paid |  |  |  |  |  |  |  |  | $ 182,000,000 | $ 156,000,000 | $ 114,000,000
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% |  |
Notes due 2020 at 1.75% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  | 1.75% |  |
Notes due 2030 at 1.75% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 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% |  |
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 |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  | 3.875% |  |
Notes due 2020 at 1.75% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  | $ 750,000,000 |  |  |  |  |  |
Notes due 2029 at 2.25% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 750,000,000 |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  | 5,000,000 |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 748,000,000 |  |  |  |  |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  | 2.25% |  |
Notes due 2048 at 4.15% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |
Payments of debt issuance costs |  |  |  |  |  |  |  | 16,000,000 |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  | 1,500,000,000 |  |  |
Long-term debt stated interest rate (in percentage) |  |  |  |  |  |  |  |  | 4.15% |  |
4.15% Notes issued in May 2018 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |
4.15% Notes issued in June 2018 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 200,000,000 |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 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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