Stockholder's Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
AOCI [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	$ (5,441)	$ (8,646)
Other comprehensive income (loss) before reclassifications	(184)	(165)
Amounts reclassified from accumulated other comprehensive loss	172	267
Accumulated other comprehensive (loss) income, ending balance	(5,453)	(8,544)
Cumulative Translation Adjustment [Member]
AOCI [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	(140)	(167)
Other comprehensive income (loss), before reclassifications, CTA	(131)	(223)
Amounts reclassified from accumulated other comprehensive loss	0	0
Accumulated other comprehensive (loss) income, ending balance	(271)	(390)
Net Revaluation and Clearance of Cash Flow Hedges to Earnings
AOCI [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	(48)	3
Other comprehensive income (loss), before reclassifications, cash flow hedges	16	(15)
Amounts reclassified from accumulated other comprehensive loss, cash flow hedges	19	(17)
Accumulated other comprehensive (loss) income, ending balance	(13)	(29)
Pension Plans [Member]
AOCI [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	(5,749)	(8,686)
Other comprehensive income, before reclassifications, pension and other benefit plans	(69)	42
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	202	428
Accumulated other comprehensive (loss) income, ending balance	(5,616)	(8,216)
Other Long-Term Employee Benefit Plans [Member]
AOCI [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	494	202
Other comprehensive income, before reclassifications, pension and other benefit plans	0	30
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	(49)	(143)
Accumulated other comprehensive (loss) income, ending balance	445	89
Unrealized Gain (Loss) on Securities
AOCI [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance	2	2
Other comprehensive income (loss), before reclassifications, securities	0	1
Amounts reclassified from accumulated other comprehensive loss, securities	0	(1)
Accumulated other comprehensive (loss) income, ending balance	$ 2	$ 2