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Postemployment Benefit Plans (AOCI) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Unrecognized accumulated other comprehensive income, before tax
Actuarial loss, net	$ 390	$ 371
Prior service cost, net	(14)	(15)
Total	376	356
Accumulated other comprehensive income expected to be recognized during the next fiscal year
Actuarial loss, net	10
Prior service cost, net	(2)
Total amount expected to be recognized	8
OPEB Plans
Unrecognized accumulated other comprehensive income, before tax
Actuarial loss, net	2	1
Prior service cost, net	(14)	(16)
Total	(12)	(15)
Accumulated other comprehensive income expected to be recognized during the next fiscal year
Prior service cost, net	(2)
Total amount expected to be recognized	(2)
U.S. | Transocean Plans
Unrecognized accumulated other comprehensive income, before tax
Actuarial loss, net	304	307
Total	304	307
Accumulated other comprehensive income expected to be recognized during the next fiscal year
Actuarial loss, net	9
Total amount expected to be recognized	9
Non-U.S. Plans | Transocean Plans
Unrecognized accumulated other comprehensive income, before tax
Actuarial loss, net	84	63
Prior service cost, net		1
Total	84	$ 64
Accumulated other comprehensive income expected to be recognized during the next fiscal year
Actuarial loss, net	1
Total amount expected to be recognized	$ 1

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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