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Company Restructuring (Tables)
12 Months Ended
Dec. 31, 2020
Restructuring and Related Activities [Abstract]  
Schedule of changes in the restructuring liability
Restructuring activity during the period
($ in millions)Employee costsExit costsTotal liability
Restructuring liability as of December 31, 2019$14 $$22 
Expense incurred214 46 260 
Adjustments to liability(4)(1)
Payments and non-cash pension settlements(159)(50)(209)
Restructuring liability as of December 31, 2020$72 $ $72