Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of January 1, 2013	$ (3,307)
Other comprehensive income (loss) before reclassifications	491
Amounts reclassified from accumulated other comprehensive income	195
Other comprehensive income (loss), net of tax	686	(119)	(888)
Balance as of December 31, 2013	(2,621)	(3,307)
Foreign currency translation adjustments (net of deferred tax liability of $7 and $9 in 2013 and 2012, respectively)	56	140
Net unrealized investment gains (net of deferred tax liability of $2 in 2013 and 2012, respectively)	5	4
Net charges related to pension / post-retirement plans (net of deferred tax asset of $1,213 and $1,657 in 2013 and 2012, respectively)	(2,682)	(3,451)
Accumulated other comprehensive income (loss)	(2,621)	(3,307)
Foreign currency translation adjustments, tax portion	7	9
Net unrealized investment gains, tax portion	2	2
Net charges related to pension/ retiree plans, tax portion	1,213	1,657
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of January 1, 2013	4
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from accumulated other comprehensive income	0
Other comprehensive income (loss), net of tax	1
Balance as of December 31, 2013	5
Accumulated other comprehensive income (loss)	5
Accumulated Defined Benefit Plans Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of January 1, 2013	(3,451)
Other comprehensive income (loss) before reclassifications	574
Amounts reclassified from accumulated other comprehensive income	195
Other comprehensive income (loss), net of tax	769
Balance as of December 31, 2013	(2,682)
Accumulated other comprehensive income (loss)	(2,682)
Accumulated Translation Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of January 1, 2013	140
Other comprehensive income (loss) before reclassifications	(84)
Amounts reclassified from accumulated other comprehensive income	0
Other comprehensive income (loss), net of tax	(84)
Balance as of December 31, 2013	56
Accumulated other comprehensive income (loss)	$ 56