Accumulated Other Comprehensive Income (Loss) (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
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period balance	$ (76)	$ (156)	$ (80)	$ (30)
Other comprehensive income (loss) before reclassifications [Abstract]
Pre-tax	(167)	74	(157)	(58)
Tax effect	12	(9)	10	(4)
Amounts reclassified from accumulated other comprehensive income to [Abstract]
Revenues	(2,678)	(2,317)	(7,577)	(6,407)
Cost of sales	(1,915)	(1,649)	(5,456)	(4,547)
Selling and administrative expenses	320	325	970	920
Net current period other comprehensive income (loss)	(156)	64	(152)	(62)
Balance at end of period	(232)	(92)	(232)	(92)
Amounts reclassified from accumulated other comprehensive income to [Member]
Amounts reclassified from accumulated other comprehensive income to [Abstract]
Revenues	(2)	1	(7)	(1)
Cost of sales	1	(4)	(1)	(4)
Selling and administrative expenses	0	2	0	5
Tax effect	0	0	3	0
Accumulated Foreign Currency Translation Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period balance	(43)		(49)
Other comprehensive income (loss) before reclassifications [Abstract]
Pre-tax	(138)		(132)
Tax effect	0		0
Amounts reclassified from accumulated other comprehensive income to [Abstract]
Net current period other comprehensive income (loss)	(138)		(132)
Balance at end of period	(181)		(181)
Accumulated Foreign Currency Translation Gain (Loss) [Member] | Amounts reclassified from accumulated other comprehensive income to [Member]
Amounts reclassified from accumulated other comprehensive income to [Abstract]
Revenues	0		0
Cost of sales	0		0
Selling and administrative expenses	0		0
Tax effect	0		0
Prior Service Credits and Net Actuarial Losses [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period balance	(45)		(45)
Other comprehensive income (loss) before reclassifications [Abstract]
Pre-tax	0		0
Tax effect	0		0
Amounts reclassified from accumulated other comprehensive income to [Abstract]
Net current period other comprehensive income (loss)	0		0
Balance at end of period	(45)		(45)
Prior Service Credits and Net Actuarial Losses [Member] | Amounts reclassified from accumulated other comprehensive income to [Member]
Amounts reclassified from accumulated other comprehensive income to [Abstract]
Revenues	0		0
Cost of sales	0		0
Selling and administrative expenses	0		0
Tax effect	0		0
Accumulated Gain (Loss) on Cash Flow Hedge Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period balance	12		14
Other comprehensive income (loss) before reclassifications [Abstract]
Pre-tax	(29)		(25)
Tax effect	12		10
Amounts reclassified from accumulated other comprehensive income to [Abstract]
Net current period other comprehensive income (loss)	(18)		(20)
Balance at end of period	(6)		(6)
Accumulated Gain (Loss) on Cash Flow Hedge Derivatives [Member] | Amounts reclassified from accumulated other comprehensive income to [Member]
Amounts reclassified from accumulated other comprehensive income to [Abstract]
Revenues	(2)		(7)
Cost of sales	1		(1)
Selling and administrative expenses	0		0
Tax effect	$ 0		$ 3