Changes in Accumulated Other Comprehensive (Loss) Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other comprehensive income (loss)	$ (567)	$ 322	$ (481)	$ 16
Currency translation and related hedging instruments [Member]
Balance at December 31, 2013			(395)
Other comprehensive (loss) income before reclassifications			(598)
Amounts reclassified from Accumulated other comprehensive (loss) income			0
Other comprehensive income (loss)			(598)
Balance at September 30, 2014	(993)		(993)
Pensions and other postretirement benefits [Member]
Balance at December 31, 2013			(1,170)
Other comprehensive (loss) income before reclassifications			19
Amounts reclassified from Accumulated other comprehensive (loss) income			99
Other comprehensive income (loss)			118
Balance at September 30, 2014	(1,052)		(1,052)
Cash flow hedges [Member]
Balance at December 31, 2013			5
Other comprehensive (loss) income before reclassifications			2
Amounts reclassified from Accumulated other comprehensive (loss) income			(3)
Other comprehensive income (loss)			(1)
Balance at September 30, 2014	4		4
Accumulated Other Comprehensive (Loss) Income [Member]
Balance at December 31, 2013			(1,560)
Other comprehensive (loss) income before reclassifications			(577)
Amounts reclassified from Accumulated other comprehensive (loss) income			96
Other comprehensive income (loss)			(481)
Balance at September 30, 2014	$ (2,041)		$ (2,041)