Accumulated Other Comprehensive Loss (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassifications out of accumulated other comprehensive income (loss) by component
INCOME (LOSS) BEFORE INCOME TAX EXPENSE	$ 299	$ (1,005)	$ 953	$ (106)
Income tax expense	111	40	369	372
Net income (loss)	188	(1,045)	584	(478)
Amount reclassified from accumulated other comprehensive income (loss)
Reclassifications out of accumulated other comprehensive income (loss) by component
Net actuarial loss	(5)	(21)	(15)	(64)
Prior service cost	(5)	(1)	(18)	(4)
INCOME (LOSS) BEFORE INCOME TAX EXPENSE	(10)	(22)	(33)	(68)
Income tax expense	(4)	(8)	(13)	(26)
Net income (loss)	$ (6)	$ (14)	$ (20)	$ (42)