Variable Interest Entities - Additional Information (Details)	Nov. 30, 2021 USD ($) vote
Revolving credit agreements
Variable Interest Entity [Line Items]
Variable interest entity, maximum borrowing capacity	$ 2,600,000,000
Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Maximum potential exposure credit enhancements	$ 31,000,000
Variable interest entity, primary beneficiary | NCSC
Variable Interest Entity [Line Items]
Number of directors for whom nomination process is controlled | vote	1
Number of votes per member for election of directors | vote	1
Variable interest entity, primary beneficiary | NCSC | Revolving credit agreements
Variable Interest Entity [Line Items]
Variable interest entity, maximum borrowing capacity	$ 1,500,000,000
Variable interest entity, primary beneficiary | NCSC | Revolving term loan
Variable Interest Entity [Line Items]
Variable interest entity, maximum borrowing capacity	$ 1,500,000,000
Variable interest entity, primary beneficiary | RTFC
Variable Interest Entity [Line Items]
Number of votes per member for election of directors | vote	1
Variable interest entity, primary beneficiary | RTFC | Revolving credit agreements
Variable Interest Entity [Line Items]
Variable interest entity, maximum borrowing capacity	$ 1,000,000,000
Variable interest entity, primary beneficiary | RTFC | Revolving term loan
Variable Interest Entity [Line Items]
Variable interest entity, maximum borrowing capacity	$ 1,500,000,000