CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 1,511	$ 1,790
Accounts receivable, net of allowance of $2 at June 30, 2020	703	654
Materials and supplies, net of allowance of $122 and $127 at June 30, 2020 and December 31, 2019, respectively	457	479
Restricted cash accounts and investments	437	558
Other current assets	176	159
Total current assets	3,284	3,640
Property and equipment	23,318	24,281
Less accumulated depreciation	(5,309)	(5,434)
Property and equipment, net	18,009	18,847
Contract intangible assets	507	608
Deferred income taxes, net	17	20
Other assets	1,008	990
Total assets	22,825	24,105
Liabilities and equity
Accounts payable	264	311
Accrued income taxes	42	64
Debt due within one year	578	568
Other current liabilities	704	781
Total current liabilities	1,588	1,724
Long-term debt	8,480	8,693
Deferred income taxes, net	294	266
Other long-term liabilities	1,476	1,555
Total long-term liabilities	10,250	10,514
Commitments and contingencies
Shares, CHF 0.10 par value, 824,648,925 authorized, 142,365,398 conditionally authorized, 639,674,414 issued and 614,612,545 outstanding at June 30, 2020, and 639,674,422 authorized, 142,365,398 conditionally authorized, 617,970,525 issued and 611,871,374 outstanding at December 31, 2019	60	59
Additional paid-in capital	13,438	13,424
Accumulated deficit	(2,188)	(1,297)
Accumulated other comprehensive loss	(329)	(324)
Total controlling interest shareholders' equity	10,981	11,862
Noncontrolling interest	6	5
Total equity	10,987	11,867
Total liabilities and equity	$ 22,825	$ 24,105