CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 976	$ 1,154
Accounts receivable, net	492	583
Materials and supplies, net	392	434
Restricted cash and cash equivalents	436	406
Other current assets	148	163
Total current assets	2,444	2,740
Property and equipment	23,152	23,040
Less accumulated depreciation	(6,054)	(5,373)
Property and equipment, net	17,098	17,667
Contract intangible assets	173	393
Deferred tax assets, net	7	9
Other assets	959	995
Total assets	20,681	21,804
Liabilities and equity
Accounts payable	228	194
Accrued income taxes	17	28
Debt due within one year	513	505
Other current liabilities	545	659
Total current liabilities	1,303	1,386
Long-term debt	6,657	7,302
Deferred tax liabilities, net	447	315
Other long-term liabilities	1,068	1,366
Total long-term liabilities	8,172	8,983
Commitments and contingencies
Shares, CHF 0.10 par value, 891,379,306 authorized, 142,363,356 conditionally authorized, 728,176,456 issued and 655,505,335 outstanding at December 31, 2021, and 824,650,660 authorized, 142,363,647 conditionally authorized, 639,676,165 issued and 615,140,276 outstanding at December 31, 2020	64	60
Additional paid-in capital	13,683	13,501
Accumulated deficit	(2,458)	(1,866)
Accumulated other comprehensive loss	(84)	(263)
Total controlling interest shareholders' equity	11,205	11,432
Noncontrolling interest	1	3
Total equity	11,206	11,435
Total liabilities and equity	$ 20,681	$ 21,804