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Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Mar. 31, 2021
Operating Leases
Remainder of 2022	$ 225
2023	366
2024	267
2025	198
2026	113
Thereafter	202
Operating lease payments	1,371
Less: imputed interest	(117)
Total operating lease liabilities	1,254	$ 1,456
Finance Leases
Remainder of 2022	188
2023	290
2024	170
2025	80
2026	28
Thereafter	3
Finance lease payments	759
Less: imputed interest	(30)
Total finance lease liabilities	$ 729	$ 894

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