Income Taxes - (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income taxes (benefit)	$ (152)	$ 7	$ (519)	$ 242
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	$ (760)	(197)	(1,374)	(1,025)
Effective Income Tax Rate Reconciliation, Percent	20.00%
Goodwill impairment	$ 1,841	0	1,841	0
Income Tax Benefit on Goodwill Impairment	76
Impairment and restructuring charges	1,126	76	1,286	649
Inventory write-down	621		587	194
Income Tax Benefit on Impairments and Inventory Write-offs	290
Valuation Allowance, U.S. Federal Tax Credit Carryforwards, Increase (Decrease), Amount			460
Merger termination fee	(3,500)	$ 0	(3,500)	$ 0
Current Income Taxes Receivable	$ 409		$ 409