Leases Lease Balance Sheet (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Sep. 30, 2019
Leases [Abstract]
Operating Lease, Right-of-Use Asset			$ 256
Finance Lease, Right-of-Use Asset			62
Lease Right of Use Assets	$ 318
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2	$ 59
Operating Lease, Liability			79
Finance Lease, Liability, Current			10
Operating Lease, Liability, Noncurrent			213
Finance Lease, Liability, Noncurrent			$ 54
Lease Liabilities	$ 356