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Non-controlling interest (Tables)
 12 Months Ended
Dec. 31, 2019
Noncontrolling Interest [Abstract]  
Schedule of changes in non-controlling interest
Changes in non-controlling interests for the periods presented in this report were as follows:
(In $ millions)
North Atlantic Drilling Ltd

 
Sevan Drilling Limited

 
Asia Offshore Drilling Ltd

 
Ship Finance VIEs

 
Seadrill Nigeria Operations Limited

 
Total

January 1, 2017 (Predecessor)
165

 
291

 
149

 
(69
)
 
6

 
542

Changes in 2017
—

 
—

 
—

 
(14
)
 
—

 
(14
)
Net (loss)/income attributable to non-controlling interest in 2017
(89
)
 
(65
)
 
—

 
24

 
1

 
(129
)
December 31, 2017 (Predecessor)
76

 
226

 
149

 
(59
)
 
7

 
399

Adoption of new accounting standard ASU 2016-16 - Income Taxes
(25
)
 
—

 
—

 
—

 
—

 
(25
)
Net (loss)/income attributable to non-controlling interest in period from January 1, 2018 to July 1, 2018
(160
)
 
(10
)
 
1

 
7

 
2

 
(160
)
Redeemable non-controlling interest
—

 
—

 
(150
)
 
—

 
—

 
(150
)
Elimination of NCI of North Atlantic Drilling Ltd and Sevan Drilling Limited
109

 
(216
)
 
—

 
—

 
—

 
(107
)
Fair value adjustment of the non-controlling interest in the Ship Finance VIEs and Seadrill Nigeria Operations Limited
—

 
—

 
—

 
199

 
(2
)
 
197

July 1, 2018 (Predecessor)
—

 
—

 
—

 
147

 
7

 
154

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
July 2, 2018 (Successor)
—

 
—

 
—

 
147

 
7

 
154

Net (loss)/income attributable to non-controlling interest in period from July 2, 2018 to December 31, 2018
—

 
—

 
—

 
(2
)
 
—

 
(2
)
December 31, 2018 (Successor)
—

 
—

 
—

 
145

 
7

 
152

Net (loss)/income attributable to non-controlling interest in 2019
—

 
—

 
—

 
(5
)
 
4

 
(1
)
December 31, 2019 (Successor)
—

 
—

 
—

 
140

 
11

 
151