CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	[1]	$ 538	$ 541
Property, plant and equipment, accumulated depreciation	[1]	16,158	16,591
Current portion of long-term debt	[1]	$ 4,471	$ 4,776

[1] Amounts may not add due to rounding.