Debt - Unsecured Senior Notes, Interest Expense and Financing Costs, and Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amount outstanding	$ 2,700	$ 2,700
Total Unsecured Senior Notes
Debt Instrument [Line Items]
Interest payable	14	15
Unsecured Debt \| 2021 Notes
Debt Instrument [Line Items]
Amount outstanding	$ 650	$ 650
Interest rate	2.30%	2.30%
Unsecured Debt \| 2026 Notes
Debt Instrument [Line Items]
Amount outstanding	$ 850	$ 850
Interest rate	3.40%	3.40%
Unsecured Debt \| 2026 Notes \| Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value of notes	$ 907	$ 893
Unsecured Debt \| 2022 Notes
Debt Instrument [Line Items]
Amount outstanding	$ 400	$ 400
Interest rate	2.60%	2.60%
Unsecured Debt \| 2027 Notes
Debt Instrument [Line Items]
Amount outstanding	$ 400	$ 400
Interest rate	3.40%	3.40%
Unsecured Debt \| 2047 Notes
Debt Instrument [Line Items]
Amount outstanding	$ 400	$ 400
Interest rate	4.50%	4.50%
Unsecured Debt \| 2047 Notes \| Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value of notes	$ 501	$ 456

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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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- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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