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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Lease, Cost [Table Text Block] Total lease cost is comprised of the following:
Year Ended December 31
$ in millions202120202019
Operating lease cost$315 $320 $318 
Variable lease cost31 28 11 
Short-term lease cost80 93 75 
Total lease cost$426 $441 $404 
Supplemental Balance Sheet Disclosures [Text Block] Supplemental operating lease balance sheet information consists of the following:
Year Ended December 31
$ in millions20212020
Operating lease right-of-use assets$1,655 $1,533 
Other current liabilities284 263 
Operating lease liabilities1,590 1,343 
Total operating lease liabilities$1,874 $1,606 
Other Supplemental Lease Information [Table Text Block] Other supplemental operating lease information consists of the following:
Year Ended December 31
$ in millions20212020
Cash paid for amounts included in the measurement of operating lease liabilities$306 $275 
Right-of-use assets obtained in exchange for new lease liabilities394 345 
Weighted average remaining lease term11.3 years12.1 years
Weighted average discount rate3.1 %3.5 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block] Maturities of operating lease liabilities as of December 31, 2021 are as follows:
$ in millions
Year Ending December 31
2022$322 
2023297 
2024251 
2025206 
2026173 
Thereafter1,058 
Total lease payments2,307 
Less: imputed interest(433)
Present value of operating lease liabilities$1,874