Leases Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Lease, Cost [Table Text Block]

Total lease cost is comprised of the following:

	Year Ended December 31
$ in millions	2020		2019
Operating lease cost	$	320	$	318
Variable lease cost	28		11
Short-term lease cost	93		75
Total lease cost	$	441	$	404

Rental expense for operating leases classified under ASC 840 for the year ended December 31, 2018 was $375 million. This amount is net of immaterial amounts of sublease income.

Supplemental Balance Sheet Disclosures [Text Block]

Supplemental operating lease balance sheet information consists of the following:

	Year Ended December 31
$ in millions	2020		2019
Operating lease right-of-use assets	$	1,533	$	1,511
Other current liabilities	263		261
Operating lease liabilities	1,343		1,308
Total operating lease liabilities	$	1,606	$	1,569

Other Supplemental Lease Information [Table Text Block]

Other supplemental operating lease information consists of the following:

	Year Ended December 31
$ in millions	2020			2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	275		$	307
Right-of-use assets obtained in exchange for new lease liabilities	345			462
Weighted average remaining lease term	12.1 years			11.6 years
Weighted average discount rate	3.5		%	3.8		%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of operating lease liabilities as of December 31, 2020 are as follows:

$ in millions
Year Ending December 31
2021	$	298
2022	267
2023	228
2024	185
2025	142
Thereafter	902
Total lease payments	2,022
Less: imputed interest	(416)
Present value of operating lease liabilities	$	1,606