Changes in Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2017

Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]

Components of comprehensive income (loss), net of tax

Changes in Foreign Currency Translation Adjustments for the three years ended December 31 were as follows:

		Foreign
		Currency
		Translation
(Millions), net of tax		Adjustments
Balances as of December 31, 2014	$	(787)
Net translation loss of investments in foreign operations		(604)
Net gains related to hedges of investment in foreign operations		235
Net change in accumulated other comprehensive loss		(369)
Balances as of December 31, 2015		(1,156)
Net translation loss of investments in foreign operations		(187)
Net gains related to hedges of investment in foreign operations		80
Net change in accumulated other comprehensive loss		(107)
Balances as of December 31, 2016		(1,263)
Net translation gain of investments in foreign operations(a)		439
Net losses related to hedges of investment in foreign operations		(174)
Net change in accumulated other comprehensive loss		265
Balances as of December 31, 2017	$	(998)

Includes $289 million of recognized tax benefit (refer to Note 11).

Accumulated Other Comprehensive Loss Income - Tax Effect

The following table shows the tax impact for the three years ended December 31 for the changes in Foreign Currency Translation Adjustments presented above:

	Tax (benefit) expense
(Millions)		2017		2016		2015
Foreign currency translation adjustments (a)	$	(209)	$	49	$	―
Net investment hedges		(103)		48		140
Total tax impact	$	(312)	$	97	$	140

Include $289 million of tax benefit recognized in the year ended December 31, 2017 (refer to Note 11).