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Revenue - Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Contract Assets (Unearned Income)
Current contract assets	$ 159		$ 159		$ 151
Long-term contract assets	9		9		13
Current unearned income	(124)		(124)		(133)
Long-term unearned income	(40)		(40)		(29)
Net Contract Assets (Unearned Income)	4		4		2
Accounts receivable, net	664		664		$ 670
Revenue recognized	$ 30	$ 22	$ 88	$ 64

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