Revenues (Tables)

12 Months Ended

Dec. 31, 2019

Revenues

Schedule of revenue disaggregation

	Year ended December 31, 2019
	U.S.		Norway		Brazil		Other		Total
Ultra-deepwater floaters	$	1,264	$	—	$	119	$	574	$	1,957
Harsh environment floaters		—		775		—		294		1,069
Deepwater floaters		—		—		6		1		7
Midwater floaters		—		—		—		55		55
Total revenues	$	1,264	$	775	$	125	$	924	$	3,088

	Year ended December 31, 2018
	U.S.		Norway		Brazil		Other		Total
Ultra-deepwater floaters	$	1,496	$	—	$	26	$	266	$	1,788
Harsh environment floaters		—		651		—		323		974
Deepwater floaters		—		—		84		40		124
Midwater floaters		—		—		—		74		74
High-specification jackups		—		—		—		58		58
Total revenues	$	1,496	$	651	$	110	$	761	$	3,018

	Year ended December 31, 2017
	U.S.		Norway		Brazil		Other		Total
Ultra-deepwater floaters	$	1,519	$	—	$	235	$	294	$	2,048
Harsh environment floaters		8		83		—		365		456
Deepwater floaters		—		—		100		44		144
Midwater floaters		—		—		—		153		153
High-specification jackups		—		—		—		172		172
Total revenues	$	1,527	$	83	$	335	$	1,028	$	2,973

Schedule of contract balances and changes

	December 31,
	2019		2018
Deferred contract revenues, recorded in other current liabilities	$	100	$	87
Deferred contract revenues, recorded in other long-term liabilities		429		399
Total contract liabilities	$	529	$	486

Significant changes in contract liabilities were as follows (in millions):

	Years ended December 31,
	2019		2018
Total contract liabilities, beginning of period	$	486	$	625
Decrease due to recognition of revenues for goods and services		(114)		(239)
Increase due to goods and services transferred over time		157		100
Total contract liabilities, end of period	$	529	$	486