Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Accrued Liabilities and Other Current Liabilities [Abstract]
Accrued compensation and benefits	$ 636				$ 473
Accrued property and equipment	331				192
Promissory note payable	0				201
Contingent consideration liability	242				0
Other current liabilities	994				583
Accrued expenses and other current liabilities	2,203				1,449
Other Liabilities [Abstract]
Income tax payable	2,431				2,458
Contingent consideration liability	0				267
Other liabilities	461				432
Other liabilities	$ 2,892	$ 2,290	$ 2,170	$ 1,867	$ 3,157