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Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Comprehensive Income
Accumulated Other Comprehensive Income
 
Other comprehensive income refers to revenues, expenses, gains and losses that under generally accepted accounting principles are included in accumulated other comprehensive income, a component of equity within the Consolidated Balance Sheets, rather than net income on the Consolidated Statements of Income. Under existing accounting standards, other comprehensive income may include, among other things, unrecognized gains and losses and prior service credit related to pension and other postretirement benefit plans.

The following tables provide the components of accumulated other comprehensive income / (loss) (AOCI) by component (in millions):
 
 
Pension and Retiree Health and Welfare Benefit Itemsa
 
Equity Method Investments
 
Total
Balance at December 31, 2016
 
$
122

 
$
(3
)
 
$
119

Other comprehensive income (loss) before reclassifications
 
114

 
—

 
114

Amounts reclassified from AOCI
 
(2
)
 
—

 
(2
)
Balance at December 31, 2017
 
$
234

 
$
(3
)
 
$
231

 
 
 
 
 
 
 
Balance at December 31, 2015
 
$
50

 
$
(2
)
 
$
48

Other comprehensive income (loss) before reclassifications
 
73

 
(1
)
 
72

Amounts reclassified from AOCI
 
(1
)
 
—

 
(1
)
Balance at December 31, 2016
 
$
122

 
$
(3
)
 
$
119

a Amounts are net of tax. See Note 13 to the Consolidated Financial Statements for additional details.

Reclassifications out of AOCIb
 
 
Year Ended
 
Year Ended
 
 
Details about AOCI Components
 
December 31, 2017
 
December 31, 2016
 
Income Statement Line Item
Amortization of pension and retiree health and welfare benefit items
 
 
 
 
 
 
     Actuarial losses
 
$
—

 
$
(1
)
 
c 
Prior service credits
 
2

 
3

 
c 
 
 
2

 
2

 
Total before tax
 
 
—

 
(1
)
 
Tax (expense) / benefit
Total reclassifications for the period
 
$
2

 
$
1

 
Net of tax
b Amounts in parenthesis indicate debits to the income statement.
c This accumulated other comprehensive income component is included in the computation of net periodic pension and retiree health and welfare cost (see Note 13 to the Consolidated Financial Statements for additional details).