Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ (2,554)	$ (3,888)
Other comprehensive income (loss) before reclassifications	13	(270)
Amounts reclassified from accumulated other comprehensive loss	162	269
Income taxes	(20)	(31)
Net other comprehensive income (loss)	155	(32)
Balance	(2,399)	(3,920)
Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(1,068)	(918)
Other comprehensive income (loss) before reclassifications	(30)	(243)
Amounts reclassified from accumulated other comprehensive loss		9
Net other comprehensive income (loss)	(30)	(234)
Balance	(1,098)	(1,152)
Fair Value of Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	29	30
Other comprehensive income (loss) before reclassifications	13	(104)
Amounts reclassified from accumulated other comprehensive loss	6	45
Net other comprehensive income (loss)	19	(59)
Balance	48	(29)
Pension and Other Postretirement Benefit Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(1,691)	(3,141)
Other comprehensive income (loss) before reclassifications		(6)
Amounts reclassified from accumulated other comprehensive loss	156	215
Income taxes	(20)	(31)
Net other comprehensive income (loss)	136	178
Balance	(1,555)	(2,963)
Unrealized Gains Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	176	141
Other comprehensive income (loss) before reclassifications	30	83
Net other comprehensive income (loss)	30	83
Balance	$ 206	$ 224