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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Assets    
Cash and cash equivalents $ 2,471 $ 3,052
Accounts receivable, net of allowance for doubtful accounts of less than $1 at June 30, 2017 and December 31, 2016 624 898
Materials and supplies, net of allowance for obsolescence of $150 and $153 at June 30, 2017 and December 31, 2016, respectively 517 561
Restricted cash 537 466
Other current assets 137 121
Total current assets 4,286 5,098
Property and equipment 24,717 27,372
Less accumulated depreciation (5,816) (6,279)
Property and equipment, net 18,901 21,093
Deferred income taxes, net 301 298
Other assets 359 400
Total assets 23,847 26,889
Liabilities and equity    
Accounts payable 173 206
Accrued income taxes 69 95
Debt due within one year 865 724
Other current liabilities 751 960
Total current liabilities 1,858 1,985
Long-term debt 6,525 7,740
Deferred income taxes, net 155 178
Other long-term liabilities 1,058 1,153
Total long-term liabilities 7,738 9,071
Commitments and contingencies
Redeemable noncontrolling interest 42 28
Shares, CHF 0.10 par value, 417,060,033 authorized, 143,783,041 conditionally authorized and 394,801,990 issued at June 30, 2017 and December 31, 2016 and 391,181,430 and 389,366,241 outstanding at June 30, 2017 and December 31, 2016, respectively 37 36
Additional paid-in capital 11,011 10,993
Retained earnings 3,457 5,056
Accumulated other comprehensive loss (300) (283)
Total controlling interest shareholders' equity 14,205 15,802
Noncontrolling interest 4 3
Total equity 14,209 15,805
Total liabilities and equity $ 23,847 $ 26,889