Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of commercial paper	$ 700	$ 1,311
Fair value of commercial paper	701
Carrying value of other short-term debt	5	$ 10
Fair value of other short-term debt	5
Carrying amount of debt	8,408
Fair value of debt	9,404
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	498
Fair value of debt	520
2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	398
Fair value of debt	434
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	795
Fair value of debt	887
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	1,245
Fair value of debt	1,432
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	496
Fair value of debt	561
2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	592
Fair value of debt	702
2030 Senior Notes (2.10% senior unsecured notes due June 15, 2030)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	1,231
Fair value of debt	1,275
2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	1,230
Fair value of debt	1,587
2050 Senior Notes (3.00% senior unsecured notes due June 15, 2050)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	1,218
Fair value of debt	$ 1,300

Commercial Paper, Fair Value Disclosure

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- Definition

Other Short-Term Borrowings, Fair Value Disclosure

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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))
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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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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.

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Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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