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Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Feb. 01, 2019	Dec. 31, 2018	Oct. 25, 2018	Jul. 31, 2018	Oct. 17, 2017	May 05, 2017
Principal amount
Total principal amount of debt	$ 9,361		$ 10,094
Debt due within one year	581		386
Long-term debt	8,780		9,708
Carrying amount
Total debt	9,261		9,978
Debt due within one year	568		373
Long-term debt	$ 8,693		9,605
Transocean Inc
Carrying amount
Percentage ownership interest in Transocean Inc. by Transocean Ltd.	100.00%
6.50% Senior Notes due November 2020
Principal amount
Total principal amount of debt	$ 206		286
Debt due within one year	206
Carrying amount
Total debt	206		288
Debt due within one year	$ 206
Debt instrument interest rate stated percentage	6.50%
6.375% Senior Notes due December 2021
Principal amount
Total principal amount of debt	$ 222		328
Carrying amount
Total debt	$ 221		327
Debt instrument interest rate stated percentage	6.375%
5.52% Senior Notes due May 2022
Principal amount
Total principal amount of debt	$ 200		282
Debt due within one year	88		83
Carrying amount
Total debt	198		280
Debt due within one year	$ 87		81
Debt instrument interest rate stated percentage	5.52%						5.52%
3.80% Senior Notes due October 2022
Principal amount
Total principal amount of debt	$ 190		411
Carrying amount
Total debt	$ 189		408
Debt instrument interest rate stated percentage	3.80%
0.50% Exchangeable Bonds due January 2023
Principal amount
Total principal amount of debt	$ 863		863
Carrying amount
Total debt	$ 862		862
Debt instrument interest rate stated percentage	0.50%
5.375% Senior Secured Notes due May 2023
Principal amount
Total principal amount of debt	$ 525
Debt due within one year	16
Carrying amount
Total debt	518
Debt due within one year	$ 14
Debt instrument interest rate stated percentage	5.375%
9.00% Senior Notes due July 2023
Principal amount
Total principal amount of debt	$ 714		1,250
Carrying amount
Total debt	$ 701		1,221
Debt instrument interest rate stated percentage	9.00%
5.875% Senior Secured Notes due January 2024
Principal amount
Total principal amount of debt	$ 667		750
Debt due within one year	83		83
Carrying amount
Total debt	656		735
Debt due within one year	$ 79		79
Debt instrument interest rate stated percentage	5.875%				5.875%
7.75% Senior Secured Notes due October 2024
Principal amount
Total principal amount of debt	$ 420		480
Debt due within one year	60		60
Carrying amount
Total debt	412		469
Debt due within one year	$ 58		58
Debt instrument interest rate stated percentage	7.75%
6.25% Senior Notes due December 2024
Principal amount
Total principal amount of debt	$ 437		500
Debt due within one year	62		62
Carrying amount
Total debt	430		489
Debt due within one year	$ 60		60
Debt instrument interest rate stated percentage	6.25%
6.125% Senior Secured Notes due August 2025
Principal amount
Total principal amount of debt	$ 534		600
Debt due within one year	66		66
Carrying amount
Total debt	525		588
Debt due within one year	$ 64		63
Debt instrument interest rate stated percentage	6.125%				6.125%
7.25% Senior Notes due November 2025
Principal amount
Total principal amount of debt	$ 750		750
Carrying amount
Total debt	$ 737		736
Debt instrument interest rate stated percentage	7.25%			7.25%
7.50% Senior Notes due January 2026
Principal amount
Total principal amount of debt	$ 750		750
Carrying amount
Total debt	$ 743		742
Debt instrument interest rate stated percentage	7.50%
6.875% Senior Secured Notes due February 2027
Principal amount
Total principal amount of debt	$ 550
Carrying amount
Total debt	$ 541
Debt instrument interest rate stated percentage	6.875%	6.875%
7.45% Notes due April 2027
Principal amount
Total principal amount of debt	$ 88		88
Carrying amount
Total debt	$ 86		86
Debt instrument interest rate stated percentage	7.45%
8.00% Debentures due April 2027
Principal amount
Total principal amount of debt	$ 57		57
Carrying amount
Total debt	$ 57		57
Debt instrument interest rate stated percentage	8.00%
7.00% Notes due June 2028
Principal amount
Total principal amount of debt	$ 300		300
Carrying amount
Total debt	$ 306		306
Debt instrument interest rate stated percentage	7.00%
Finance lease contract due August 2029
Principal amount
Total principal amount of debt			511
Debt due within one year			32
Carrying amount
Total debt			511
Debt due within one year			32
7.50% Notes due April 2031
Principal amount
Total principal amount of debt	$ 588		588
Carrying amount
Total debt	$ 585		585
Debt instrument interest rate stated percentage	7.50%					7.50%
6.80% Senior Notes due March 2038
Principal amount
Total principal amount of debt	$ 1,000		1,000
Carrying amount
Total debt	$ 991		991
Debt instrument interest rate stated percentage	6.80%
7.35% Senior Notes due December 2041
Principal amount
Total principal amount of debt	$ 300		300
Carrying amount
Total debt	$ 297		$ 297
Debt instrument interest rate stated percentage	7.35%

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