Leases (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Lease, Cost [Table Text Block]

	Year Ended December 31,
(Dollars in millions)	2023		2022		2021
Lease Expense Components:
Operating Lease Expense	$	60	$	57	$	61
Short-term and Variable Lease Expense	174		90		65
Subtotal of Operating Lease Expense	$	234	$	147	$	126
Finance Lease Expense: Amortization of Assets and Interest on Lease Liabilities	19		18		16
Sublease Income	(2)		(3)		(4)
Total Lease Expense	$	251	$	162	$	138

Operating and Finance Lease Maturities [Table Text Block]

	Operating		Finance
(Dollars in millions)	Leases		Leases
Maturity of Lease Liabilities as of December 31, 2023:
2024	$	58	$	21
2025	48		18
2026	36		15
2027	25		5
2028	13		1
After 2028	93		—
Total Lease Payments	273		60
Less: Interest	(96)		(7)
Present Value of Lease Liabilities	$	177	$	53

Supplemental Lease Disclosures [Table Text Block]

	Years Ended
(Dollars in millions except years and percentages)	12/31/2023			12/31/2022			12/31/2021
Other Supplemental Information:
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$	67		$	80		$	89
Operating cash outflows from finance leases	$	5		$	5		$	5
Financing cash outflows from finance leases	$	18		$	16		$	13
Assets obtained in exchange for:
Operating leases	$	70		$	50		$	23
Finance leases	$	16		$	18		$	6
Weighted-average remaining lease term (years)
Operating leases	8.4			8.8			8.9
Finance leases	3.1			3.9			4.8
Weighted-average discount rate (percentages)
Operating leases	8.8		%	9.1		%	9.6		%
Finance leases	8.2		%	8.5		%	8.9		%