SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Notes)

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

			Additions (Deductions)
	Balance at		Charged to				Charged to				Other				Balance at
	Beginning of		Costs and				Other				Additions				End of
	Year		Expense				Accounts				(Deductions)				Year
Reserves and allowances deducted
from asset accounts:
Valuation allowance for deferred tax assets
Year Ended December 31, 2017	$	6,058	$	(1,484	)	a	$	1		b	$	—			$	4,575
Year Ended December 31, 2016	4,183		1,852				23			b	—				6,058
Year Ended December 31, 2015	2,434		1,749				—				—				4,183
Reserves for non-income taxes:
Year Ended December 31, 2017	$	64	$	(2	)		$	—			$	(4	)	c	$	58
Year Ended December 31, 2016	83		13				(3		)		(29		)	c	64
Year Ended December 31, 2015	93		9				—				(19		)	c	83

a. Relates to a $1.1 billion decrease associated with a reduction in the corporate income tax rate applicable to U.S. federal deferred tax assets and $371 million for the reversal of valuation allowances on U.S. federal alternative minimum tax credits.

b. Relates to a valuation allowance for tax benefits primarily associated with actuarial losses for U.S. defined benefit plans included in other comprehensive loss.

c. Represents amounts paid or adjustments to reserves based on revised estimates.