Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities and Other Current Liabilities [Abstract]
Accrued compensation and benefits	$ 1,203	$ 790
Accrued property and equipment	1,531	685
Overdraft in cash pooling entities	500	0
Accrued taxes	491	340
Other current liabilities	1,784	1,077
Accrued expenses and other current liabilities	5,509	2,892
Other Liabilities [Abstract]
Income tax payable	4,655	5,372
Deferred tax liabilities	673	50
Other liabilities	862	995
Other liabilities	$ 6,190	$ 6,417