Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	$ (69)	$ (107)	$ (80)	$ (30)
Net current period other comprehensive income (loss)	(7)	(49)	4	(126)
Balance at end of period	(76)	(156)	(76)	(156)
Other comprehensive income (loss) before reclassifications [Abstract]
Pre-tax	(6)	(51)	10	(132)
Tax effect	1	1	(2)	5
Amounts reclassified from accumulated other comprehensive income (loss) to [Abstract]
Revenues	(2,641)	(2,209)	(5,072)	(4,270)
Cost of sales	(1,893)	(1,567)	(3,658)	(3,020)
Selling and administrative expenses	346	315	675	618
Amounts reclassified from accumulated other comprehensive income to [Member]
Amounts reclassified from accumulated other comprehensive income (loss) to [Abstract]
Revenues	(2)	0	(5)	(2)
Cost of sales	(2)	0	(2)
Selling and administrative expenses	0	1	0	3
Tax effect	2	0	3	0
Accumulated Foreign Currency Translation Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(40)		(49)
Net current period other comprehensive income (loss)	(3)		6
Balance at end of period	(43)		(43)
Other comprehensive income (loss) before reclassifications [Abstract]
Pre-tax	(3)		6
Tax effect	0		0
Accumulated Foreign Currency Translation Gain (Loss) [Member] | Amounts reclassified from accumulated other comprehensive income to [Member]
Amounts reclassified from accumulated other comprehensive income (loss) 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]
Balance at beginning of period	(45)		(45)
Net current period other comprehensive income (loss)	0		0
Balance at end of period	(45)		(45)
Other comprehensive income (loss) before reclassifications [Abstract]
Pre-tax	0		0
Tax effect	0		0
Prior Service Credits and Net Actuarial Losses [Member] | Amounts reclassified from accumulated other comprehensive income to [Member]
Amounts reclassified from accumulated other comprehensive income (loss) 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]
Balance at beginning of period	16		14
Net current period other comprehensive income (loss)	(4)		(2)
Balance at end of period	12		12
Other comprehensive income (loss) before reclassifications [Abstract]
Pre-tax	(3)		4
Tax effect	1		(2)
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 (loss) to [Abstract]
Revenues	(2)		(5)
Cost of sales	(2)		(2)
Selling and administrative expenses	0		0
Tax effect	$ 2		$ 3