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Fair Value Measurements - Schedule of Long-Term Debt is Recorded at Amortized Cost (Details) - Recurring - Fair value, inputs, level 2 - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of liabilities	$ 5,956	$ 7,148
Estimated fair values of liabilities	$ 6,376	$ 7,785

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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