Comprehensive Income and Shareholders Equity (Tables)

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Changes in each component of accumulated other comprehensive items, net of tax are as follows: 

(In millions)	Currency Translation Adjustment			Unrealized Losses on Available-for- Sale Investments			Unrealized Losses on Hedging Instruments			Pension and Other Postretirement Benefit Liability Adjustment			Total
Balance at December 31, 2017	$	(1,755	)	$	(1	)	$	(50	)	$	(197	)	$	(2,003	)
Cumulative effect of accounting changes (Note 1)	(54		)	1			(11		)	(24		)	(88		)
Other comprehensive income (loss) before reclassifications	47			—			—			(2		)	45
Amounts reclassified from accumulated other comprehensive items	—			—			2			2			4
Net other comprehensive items	47			—			2			—			49
Balance at March 31, 2018	$	(1,762	)	$	—		$	(59	)	$	(221	)	$	(2,042	)