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Notes Payable - Summary of Company Issued and Publicly Sold Unsecured Senior Notes (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($)
2022 Ten-year Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Nov. 28, 2012
Principal amount | $ 750
Mature date | Nov. 28, 2022
Effective interest rate | 3.59%
2019 Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Jun. 09, 2014
Principal amount | $ 1,000
Mature date | Jun. 09, 2019
Effective interest rate | 3.00%
2020 Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Jun. 30, 2015
Principal amount | $ 750
Mature date | Jun. 30, 2020
Effective interest rate | 3.13%
2025 Ten-year Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Jun. 30, 2015
Principal amount | $ 500
Mature date | Jun. 30, 2025
Effective interest rate | 4.22%
2022 Five-year Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Jul. 06, 2017
Principal amount | $ 900
Mature date | Jul. 06, 2022
Effective interest rate | 3.08%
2027 Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Jul. 06, 2017
Principal amount | $ 600
Mature date | Jul. 06, 2027
Effective interest rate | 3.73%
2023 Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Mar. 29, 2018
Principal amount | $ 1,000
Mature date | Sep. 29, 2023
Effective interest rate | 3.99%
2028 March Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Mar. 29, 2018
Principal amount | $ 500
Mature date | Mar. 29, 2028
Effective interest rate | 4.50%
2024 Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Nov. 14, 2018
Principal amount | $ 850
Mature date | May 14, 2024
2024 Notes | Minimum [Member] |
Debt and Financial Instruments [Line Items] |
Effective interest rate | 4.51%
2024 Notes | Maximum [Member] |
Debt and Financial Instruments [Line Items] |
Effective interest rate | 4.54%
2028 November Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Nov. 14, 2018
Principal amount | $ 400
Mature date | Nov. 14, 2028
Effective interest rate | 4.99%
2025 Five-year Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Apr. 07, 2020
Principal amount | $ 600
Mature date | Apr. 07, 2025
Effective interest rate | 3.22%
2030 Notes |
Debt and Financial Instruments [Line Items] |
Issue date | Apr. 07, 2020
Principal amount | $ 400
Mature date | Apr. 07, 2030
Effective interest rate | 3.54%

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