Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Examination [Line Items]
Gross deferred tax asset related to net operating loss carryforwards	$ 5,767	$ 3,852
Gross deferred tax asset related to foreign net operating loss carryforwards	$ 2,610
Year in which foreign net operating loss carryforwards begin to expire	2024
Gross deferred tax asset related to net U.S. federal operating loss carryforwards	$ 2,766
Year in which U.S. federal net operating loss carryforwards begin to expire	2021
Gross deferred tax asset related to net operating loss carryforwards for various U.S. states	$ 391
Year in which various U.S. states net operating loss carryforwards begin to expire	2017
Deferred tax asset related to foreign net operating loss carryforwards, net of valuation allowance	$ 1,468
Deferred tax asset related to U.S. federal net operating loss carryforwards, net of valuation allowance	39
Alternative minimum tax credit carryforwards	77
Other business credit carryforwards	6
Deferred tax asset related to business credit carryforwards, net of valuation allowance	1
Foreign tax credit carryforwards - Before valuation allowance	$ 81
Year in which foreign tax credit carryforwards begin to expire	2017
Valuation allowance against net deferred tax assets	$ 5,450	1,579
Additional valuation allowance against net deferred tax assets during the year	$ 1,066
Period of cumulative loss incurred	3 years
Unrecognized tax benefits that would impact effective income tax rate	$ 233
Unrecognized tax benefits decrease reasonably possible	85
Accrued interest and penalties	29	74
Undistributed earnings from foreign subsidiaries expected to be indefinitely reinvested in foreign operations	7,600
U.S., Denmark and Malaysia
Income Tax Examination [Line Items]
Valuation allowance against net deferred tax assets	$ 3,749	$ 2,683