Revenues (Tables)

9 Months Ended

Sep. 30, 2021

Revenues

Schedule of revenue disaggregation

	Three months ended September 30, 2021								Three months ended September 30, 2020
	U.S.		Norway		Other		Total		U.S.		Norway		Other		Total
Ultra-deepwater floaters	$	280	$	—	$	148	$	428	$	295	$	—	$	195	$	490
Harsh environment floaters		—		185		13		198		—		233		50		283
Total contract drilling revenues	$	280	$	185	$	161	$	626	$	295	$	233	$	245	$	773

	Nine months ended September 30, 2021								Nine months ended September 30, 2020
	U.S.		Norway		Other		Total		U.S.		Norway		Other		Total
Ultra-deepwater floaters	$	819	$	—	$	469	$	1,288	$	1,022	$	—	$	632	$	1,654
Harsh environment floaters		4		609		34		647		—		647		149		796
Midwater floaters		—		—		—		—		—		—		12		12
Total contract drilling revenues	$	823	$	609	$	503	$	1,935	$	1,022	$	647	$	793	$	2,462

Schedule of contract balances and changes

	September 30,		December 31,
	2021		2020
Deferred contract revenues, recorded in other current liabilities	$	89	$	133
Deferred contract revenues, recorded in other long-term liabilities		280		323
Total contract liabilities	$	369	$	456

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

	Nine months ended
	September 30,
	2021		2020
Total contract liabilities, beginning of period	$	456	$	529
Decrease due to recognition of revenues for goods and services		(117)		(153)
Increase due to goods and services transferred over time		30		108
Total contract liabilities, end of period	$	369	$	484