Contract Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

Total contract assets and contract liabilities as of June 30, 2021 and December 31, 2020 are as follows:

(dollars in millions)	June 30, 2021		December 31, 2020
Contract assets	$	10,485	$	9,931
Contract liabilities	(12,591)		(12,889)
Net contract liabilities	$	(2,106)	$	(2,958)