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Borrowings - Narrative (Details) | May 26, 2021 USD ($) | Apr. 30, 2021 USD ($) commercial_paper_program
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Line of Credit Facility [Line Items] |  |
Number of commercial paper programs | commercial_paper_program |  | 2
Commercial paper |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity under credit facility |  | $ 6,000,000,000.0
Revolving credit facility | Senior Unsecured Committed Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity under credit facility |  | 4,000,000,000.0
Revolving credit facility | Revolving Credit Facility, 364-Day |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity under credit facility |  | 1,000,000,000.0
Senior unsecured revolving credit facility | Subsequent event |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity under credit facility | $ 5,000,000,000.0 |
Revolving credit facility, term | 5 years |
Credit facilities |  |
Line of Credit Facility [Line Items] |  |
Available borrowing resources |  | $ 634,000,000

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