Changes in Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Changes in Other Comprehensive Income [Abstract]

Changes in Other Comprehensive Income [Table Text Block]

The following table provides the reclassifications out of other comprehensive income, net of tax.

Year Ended December 31, 2017
(in millions)	Foreign Currency Translation Adjustments			Unrealized Gains/Losses on Derivative Financial Instruments			Unrealized Gains/Losses on Available-for-Sale Securities			Defined Benefit Pension Items/Other			Total
Beginning Balance	$	(79	)	$	107		$	(6	)	$	(21	)	$	1
Other comprehensive income (loss) before reclassifications	48			(65		)	(10		)	(8		)	(35		)
Amounts reclassified from accumulated other comprehensive income	—			(42		)	15			2			(25		)
Net current-period other comprehensive income	48			(106		)	5			(6		)	(59		)
Ending Balance	$	(32	)	$	1		$	(1	)	$	(27	)	$	(59	)

Year Ended December 31, 2016
(in millions)	Foreign Currency Translation Adjustments			Unrealized Gains/Losses on Derivative Financial Instruments			Unrealized Gains/Losses on Available-for-Sale Securities			Defined Benefit Pension Items/Other			Total
Beginning Balance	$	(54	)	$	152		$	—		$	(10	)	$	88
Other comprehensive income (loss) before reclassifications	(25		)	40			(6		)	(17		)	(8		)
Amounts reclassified from accumulated other comprehensive income	—			(85		)	—			6			(79		)
Net current-period other comprehensive income	(25		)	(45		)	(6		)	(11		)	(87		)
Ending Balance	$	(79	)	$	107		$	(6	)	$	(21	)	$	1