Comprehensive Income

6 Months Ended

Jun. 30, 2012

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Comprehensive Income

Comprehensive Income

Other comprehensive income refers to revenues, expenses, gains and losses that under generally accepted accounting principles are included in 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 and accounting for derivative financial instruments, which qualify for cash flow hedge accounting.

The following table provides the components of accumulated other comprehensive loss (in millions):

	June 30, 2012			December 31, 2011
Unrecognized prior service credit and actuarial losses, net of tax (see Note 8)	$	(209	)	$	(213	)
Fuel hedge mark-to-market, net of tax (see Note 2)	—			11
Accumulated other comprehensive loss of equity method investees	(4		)	(1		)
Total accumulated other comprehensive loss	$	(213	)	$	(203	)