Lease Commitments - Schedule of Future Lease Payments for Operating and Finance Leases After Adoption (Details) $ in Millions	Sep. 30, 2021 USD ($)
Operating leases
2022	$ 50
2023	46
2024	42
2025	37
2026	31
Thereafter	174
Total future lease payments	380
Imputed interest	68
Present value of lease liabilities	312
Finance leases
2022	18
2023	18
2024	18
2025	18
2026	19
Thereafter	166
Total future lease payments	257
Imputed interest	70
Present value of lease liabilities	187
Undiscounted future lease payments for leases not yet commenced	$ 101
Undiscounted future lease payments for leases not yet commenced, term of lease	15 years