Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ (2,554)	$ (3,888)
Other comprehensive income (loss) before reclassifications	(61)	(159)
Amounts reclassified from accumulated other comprehensive loss	70	185
Income taxes	(10)	(14)
Net other comprehensive income (loss)	(1)	12
Balance	(2,555)	(3,876)
Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(1,068)	(918)
Other comprehensive income (loss) before reclassifications	(88)	(77)
Amounts reclassified from accumulated other comprehensive loss
Income taxes
Net other comprehensive income (loss)	(88)	(77)
Balance	(1,156)	(995)
Fair Value of Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	29	30
Other comprehensive income (loss) before reclassifications	16	(154)
Amounts reclassified from accumulated other comprehensive loss	(3)	80
Income taxes
Net other comprehensive income (loss)	13	(74)
Balance	42	(44)
Pension and Other Postretirement Benefit Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(1,691)	(3,141)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from accumulated other comprehensive loss	73	105
Income taxes	(10)	(14)
Net other comprehensive income (loss)	63	91
Balance	(1,628)	(3,050)
Unrealized Gains Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	176	141
Other comprehensive income (loss) before reclassifications	11	72
Amounts reclassified from accumulated other comprehensive loss
Income taxes
Net other comprehensive income (loss)	11	72
Balance	$ 187	$ 213