Debt (Short Term Debt Narrative) (Details) (USD $)							12 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 4 percent Convertible Senior Notes [Member]	Dec. 31, 2012 4 percent Convertible Senior Notes [Member]	Dec. 31, 2011 4 percent Convertible Senior Notes [Member]	Nov. 30, 2009 4 percent Convertible Senior Notes [Member]	Dec. 31, 2013 Accounts Receivable Securitization Facility [Member]	Dec. 31, 2013 $2.3 billion ABL Facility [Member]	Dec. 31, 2013 Original Terms [Member] Accounts Receivable Securitization Facility [Member]	Jun. 30, 2008 Original Terms [Member] $2.3 billion ABL Facility [Member]	Dec. 31, 2013 Amended Terms [Member] Accounts Receivable Securitization Facility [Member]	Dec. 31, 2013 Amended Terms [Member] $2.3 billion ABL Facility [Member]	Dec. 31, 2013 Subsidiaries [Member]	Dec. 31, 2012 Subsidiaries [Member]	Dec. 31, 2013 Subsidiaries [Member] Accounts Receivable Securitization Facility [Member]		Dec. 31, 2012 Subsidiaries [Member] Accounts Receivable Securitization Facility [Member]		Dec. 31, 2013 Subsidiaries [Member] $2.3 billion ABL Facility [Member]		Dec. 31, 2012 Subsidiaries [Member] $2.3 billion ABL Facility [Member]		Dec. 31, 2013 Parent Company [Member] 4 percent Convertible Senior Notes [Member]		Dec. 31, 2012 Parent Company [Member] 4 percent Convertible Senior Notes [Member]
Short-term Debt [Line Items]
Total debt	$ 7,173,000,000	$ 7,309,000,000											$ 7,037,000,000	$ 7,172,000,000	$ 430,000,000	[1]	$ 453,000,000	[1]	$ 1,106,000,000	[1]	$ 1,184,000,000	[1]	$ 136,000,000	[2]	$ 137,000,000
Stated interest rate			4.00%	4.00%	4.00%	4.00%
Average outstanding amount							450,000,000
Interest rate during period							0.80%
Maximum month-end outstanding amount							494,000,000
Line of credit facility, maximum borrowing capacity									475,000,000	1,250,000,000.000	550,000,000	2,300,000,000.0							2,300,000,000.0
Extension period							364 days
Collateral amount							501,000,000
Debt instrument, term										5 years
Line of credit facility, average outstanding amount								1,187,000,000
Line of credit facility, interest rate during period								2.30%
Line of credit facility, maximum month-end outstanding amount								$ 1,478,000,000

[1] $1,142 and $53 were available under our ABL facility and accounts receivable securitization facility, respectively, at December 31, 2013. The ABL facility availability is reflected net of $52 of letters of credit. At December 31, 2013, the interest rates applicable to our ABL facility and accounts receivable securitization facility were 2.5 percent and 0.8 percent, respectively.

[2] The fair value of the 4 percent Convertible Senior Notes is based on the market value of comparable notes. Consistent with the carrying amount, the fair value excludes the equity component of the notes. To exclude the equity component and calculate the fair value, we used an effective interest rate of 6.6 percent. As discussed below (see note 12), the total cost to settle the notes based on the closing price of our common stock on December 31, 2013 would be $1,094.