Income Taxes (Exp) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income taxes
Effective tax rate	(25.70%)	(5.10%)	(4.90%)
Components of provision (benefit) for income taxes
Current tax benefit	$ (7)	$ (33)	$ (189)
Deferred tax expense	128	60	248
Income tax expense	$ 121	27	59
Income tax expense reconciliation
Income tax expense (benefit) at Swiss federal statutory rate	7.83%
Changes in valuation allowance	$ 1,167	(31)	37
Income tax benefit at Swiss federal statutory rate	(36)	(42)	(94)
Earnings subject to rates different than the Swiss federal statutory rate	78	82	189
Deemed profits taxes	17	19	22
Jurisdictional ownership changes of certain assets	16
Withholding taxes	10	6	11
Losses on impairment	5	52	35
Changes in unrecognized tax benefits, net	(43)	(15)	(268)
Swiss Federal Act on Tax Reform and AHV Financing	(1,095)
Base erosion and anti-abuse tax		5	21
U.S. Coronavirus Aid, Relief, and Economic Security Act		(28)
Other, net	2	(21)	8
Income tax expense	121	$ 27	59
Swiss historic depreciation and financing asset costs	$ 1,333
U.S.
Income tax expense reconciliation
Other, net			98
Charter rig and other equipment
Components of provision (benefit) for income taxes
Income tax expense			21
Income tax expense reconciliation
Income tax expense			$ 21