Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2022	Apr. 01, 2020
Summary Of Significant Accounting Policies [Line Items]
Retained earnings	$ 15,649		$ 17,205
Allowance for credit losses	$ 1,489		$ 1,246
ASU 2016-13 [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adoption date				Apr. 01, 2020
Change in accounting principle, accounting standards update, adopted [true false]				true
Change in accounting principle, accounting standards update, immaterial effect [true false]				false
ASU 2021-05 [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adoption date		Apr. 01, 2022
Change in accounting principle, accounting standards update, adopted [true false]		true
Change in accounting principle, accounting standards update, immaterial effect [true false]		true
Cumulative Effect Period of Adoption Adjustment | ASU 2016-13 [Member]
Summary Of Significant Accounting Policies [Line Items]
Retained earnings				$ 218
Allowance for credit losses				292
Interest Receivable				$ 190
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Finance Operations [Member] | California [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Percentage	21.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Finance Operations [Member] | Texas [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Percentage	13.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Finance Operations [Member] | New York [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Percentage	7.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Finance Operations [Member] | New Jersey [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Percentage	5.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Voluntary Protection Operations [Member] | California [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Percentage	25.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Voluntary Protection Operations [Member] | New York [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Percentage	6.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Voluntary Protection Operations [Member] | Maryland [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Percentage	5.00%