Bank Financing and Debt (Details) (USD $)	6 Months Ended							6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2013 Senior Debt [Member]	Jun. 14, 2014 Senior Notes 2014 [Member]	Jun. 30, 2014 Senior Notes 2014 [Member] Senior Debt [Member]	Jun. 30, 2014 Revolving Credit Facility [Member]	Jun. 30, 2014 Revolving Credit Facility [Member] Maximum Consolidated Leverage Ratio [Member]	Jun. 30, 2014 Revolving Credit Facility [Member] Consolidated Leverage Ratio [Member]	Jun. 30, 2014 Commercial Paper [Member]	Dec. 31, 2013 Commercial Paper [Member]	Jun. 30, 2014 Continuing Operations [Member]	Dec. 31, 2013 Continuing Operations [Member]	Jun. 30, 2014 Discontinued Operations [Member]	Jan. 31, 2014 Discontinued Operations [Member]	Dec. 31, 2013 Discontinued Operations [Member]
Bank Financing And Debt Details [Abstract]
Commercial paper	$ 381,000,000		$ 475,000,000
Senior debt (1.95% - 8.875% due 2014 - 2042)	5,761,000,000		5,848,000,000
Obligations under capital leases	105,000,000		112,000,000
Less current portion of long-term debt	20,000,000		20,000,000
Total long-term debt from continuing operations, net of current portion	5,846,000,000		5,940,000,000
Total Debt [Line Items]
Total debt												6,247,000,000	6,435,000,000
Long-term debt														1,598,000,000		13,000,000
Debt Parentheticals [Abstract]
Minimum interest rate of senior debt	1.95%
Maximum interest rate of senior debt	8.875%
Net unamortized discount on senior debt	12,000,000		13,000,000
Increase in carrying value of debt relating to previously settled fair value hedges	16,000,000		18,000,000
Credit Facility [Line Items]
Maximum borrowing capacity under the credit facility							2,000,000,000			2,000,000,000
Availability under the credit facility							1,990,000,000
Weighted average interest rate										0.30%	0.30%
Amount borrowed under credit facility							0
Credit Facility covenant description								4.5x
Credit Facility covenant compliance									1.8x
Debt Instruments [Line Items]
Stated interest rate					8.75%
Repyament of senior notes	99,000,000	0
Face value of debt				$ 5,840,000,000		$ 5,760,000,000									$ 1,600,000,000