Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of commercial paper	$ 1,318	$ 951
Fair value of commercial paper	1,323
Carrying value of other short-term debt	11	$ 0
Fair value of other short-term debt	11
Carrying amount of debt	7,825
Fair value of debt	8,399
2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of debt	1,247
Fair value of debt	$ 1,260
Interest rate, stated percentage	2.75%
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	$ 497
Fair value of debt	$ 505
Interest rate, stated percentage	2.35%
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	$ 397
Fair value of debt	$ 419
Interest rate, stated percentage	3.45%
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	$ 794
Fair value of debt	$ 855
Interest rate, stated percentage	4.00%
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	$ 1,244
Fair value of debt	$ 1,349
Interest rate, stated percentage	3.75%
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	$ 524
Interest rate, stated percentage	3.10%
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	$ 660
Interest rate, stated percentage	3.75%
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	$ 1,229
Fair value of debt	$ 1,493
Interest rate, stated percentage	4.25%

Commercial Paper, Fair Value Disclosure

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- Definition

Other Short-Term Borrowings, Fair Value Disclosure

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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

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

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-Publisher FASB
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Contractual interest rate for funds borrowed, under the debt agreement.

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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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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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