Revenues (Tables)

12 Months Ended

Dec. 31, 2020

Revenues

Schedule of revenue disaggregation

	Year ended December 31, 2020								Year ended December 31, 2019								Year ended December 31, 2018
	U.S.		Norway		Other (a)		Total		U.S.		Norway		Other (a)		Total		U.S.		Norway		Other (a)		Total
Ultra-deepwater floaters	$	1,302	$	—	$	792	$	2,094	$	1,264	$	—	$	693	$	1,957	$	1,496	$	—	$	292	$	1,788
Harsh environment floaters		—		876		170		1,046		—		775		294		1,069		—		651		323		974
Deepwater floaters		—		—		—		—		—		—		7		7		—		—		124		124
Midwater floaters		—		—		12		12		—		—		55		55		—		—		74		74
High-specification jackups		—		—		—		—		—		—		—		—		—		—		58		58
Total revenues	$	1,302	$	876	$	974	$	3,152	$	1,264	$	775	$	1,049	$	3,088	$	1,496	$	651	$	871	$	3,018

(a) Other represents the aggregate value for countries in which we operate that individually had attributable operating revenues representing less than 10 percent of consolidated operating revenues earned.

Schedule of contract balances and changes

	December 31,
	2020		2019
Deferred contract revenues, recorded in other current liabilities	$	133	$	100
Deferred contract revenues, recorded in other long-term liabilities		323		429
Total contract liabilities	$	456	$	529

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

	Years ended December 31,
	2020		2019
Total contract liabilities, beginning of period	$	529	$	486
Decrease due to recognition of revenues for goods and services		(184)		(114)
Increase due to goods and services transferred over time		111		157
Total contract liabilities, end of period	$	456	$	529