v3.20.4

Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Average rate of interest | 4.20% |
Principal amount outstanding 2020 | $ 7,650 | $ 7,400
Due in 2021 | 0 |
Due after 2021 | 7,650 |
Due after 2025 | $ 4,250 |
Average remaining term (in years) | 5 years 3 months 18 days |
2024 Revolving Credit Facility | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Range of interest rates | 0.00% |
Average rate of interest | 0.00% |
Principal amount outstanding 2020 |  | 0
Revolving credit facility | $ 1,500 |
Notes Payable to Banks | USD notes |  |
Debt Instrument [Line Items] |  |
Average rate of interest | 4.20% |
Principal amount outstanding 2020 | $ 7,650 | 7,400
Due in 2021 | 0 |
Due after 2021 | 7,650 |
Due after 2025 | $ 4,250 |
Average remaining term (in years) | 5 years 3 months 18 days |
Notes Payable to Banks | USD notes | Minimum |  |
Debt Instrument [Line Items] |  |
Range of interest rates | 2.70% |
Notes Payable to Banks | USD notes | Maximum |  |
Debt Instrument [Line Items] |  |
Range of interest rates | 5.60% |
Bank Borrowings |  |
Debt Instrument [Line Items] |  |
Range of interest rates | 0.00% |
Average rate of interest | 0.00% |
Principal amount outstanding 2020 |  | $ 0

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