CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 3,052	$ 2,339	$ 2,635	$ 3,243
Accounts receivable, net
Trade	833	1,343
Other	65	57
Materials and supplies, net	561	627
Restricted cash	466	340
Other current assets	121	92
Total current assets	5,098	4,798
Property and equipment	27,372	26,265
Less accumulated depreciation	(6,279)	(5,456)
Property and equipment, net	21,093	20,809
Deferred income taxes, net	298	411
Other assets	400	413
Total assets	26,889	26,431
Liabilities and equity
Accounts payable	206	455
Accrued income taxes	95	55
Debt due within one year	724	1,093
Other current liabilities	960	1,062
Total current liabilities	1,985	2,665
Long-term debt	7,740	7,397
Deferred income taxes, net	178	229
Other long-term liabilities	1,153	1,135
Total long-term liabilities	9,071	8,761
Commitments and contingencies
Redeemable noncontrolling interest	28	5	11
Shares, CHF 0.10 par value, 417,060,033 authorized, 143,783,041 conditionally authorized, 394,801,990 issued and 389,366,241 outstanding at December 31, 2016 and CHF 15.00 par value, 396,260,487 authorized, 167,617,649 conditionally authorized, 373,830,649 issued and 364,035,397 outstanding at December 31, 2015	36	5,193
Additional paid-in capital	10,993	5,736
Treasury shares, at cost, 2,863,267 held at December 31, 2015		(240)
Retained earnings	5,056	4,278
Accumulated other comprehensive loss	(283)	(277)
Total controlling interest shareholders' equity	15,802	14,690
Noncontrolling interest	3	310
Total equity	15,805	15,000	$ 14,104	$ 16,719
Total liabilities and equity	$ 26,889	$ 26,431