Contract Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The following summarizes information about our contract assets and liabilities:

(in millions)	June 30, 2020		December 31, 2019
Information about contract assets:
Contract assets
Unbilled receivables	$	692	$	851
Contract work in progress	378		387
Contract assets	$	1,070	$	1,238
Advance billings deducted from contract assets	$	474	$	574
	Six Months Ended June 30,
(in millions)	2020		2019
Revenue recognized that was included in contract liabilities as of January 1	$	647	$	704