Financing Agreements - Schedule of Long-term Debt (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 1,586	$ 1,599
Less: current maturities	6	32
Total long-term debt	1,580	1,567
Senior Notes Due February 2019 [Member]
Debt Instrument [Line Items]
Interest Rate	6.50%	6.50%
Long-term Debt and Capital Lease Obligations, Including Current Maturities	400	400
Senior Notes Due February 2021 [Member]
Debt Instrument [Line Items]
Interest Rate	6.75%	6.75%
Long-term Debt and Capital Lease Obligations, Including Current Maturities	350	350
Senior Notes Due September 2021 [Member]
Debt Instrument [Line Items]
Interest Rate	5.375%	5.375%
Long-term Debt and Capital Lease Obligations, Including Current Maturities	450	450
Senior Notes Due September 2023 [Member]
Debt Instrument [Line Items]
Interest Rate	6.00%	6.00%
Long-term Debt and Capital Lease Obligations, Including Current Maturities	300	300
Other indebtedness [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 86	$ 99