Financing Arrangements and Derivative Financial Instruments Financing Arrangements and Derivative Financial Instruments (Senior Notes - Narrative) (Details) (6.5% Notes due 2021, USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Feb. 25, 2013
Debt Instrument, Face Amount	$ 900
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Notes sold at as a percentage of principle amount	100.00%
Debt Instrument, Maturity Date	Mar. 01, 2021
Percent of Notes That May Be Redeemed With Certain Equity Offerings	35.00%
Debt Instrument, Restrictive Covenants	The terms of the indenture for these notes, among other things, limit our ability and the ability of certain of our subsidiaries to (i) incur additional debt or issue redeemable preferred stock, (ii) pay dividends or make certain other restricted payments or investments, (iii) incur liens, (iv) sell assets, (v) incur restrictions on the ability of our subsidiaries to pay dividends to us, (vi) enter into affiliate transactions, (vii) engage in sale and leaseback transactions, and (viii) consolidate, merge, sell or otherwise dispose of all or substantially all of our assets. These covenants are subject to significant exceptions and qualifications. For example, if these notes are assigned an investment grade rating by Moody's and Standard & Poor's and no default has occurred or is continuing, certain covenants will be suspended.
Period Commencing March 1, 2016 [Domain]
Debt Instrument [Line Items]
Redemption Price In Percentage	104.875%
Redemption Price In Percentage With Proceeds Of Certain Equity Offerings	106.50%
Period Commencing March 1, 2017 [Domain]
Debt Instrument [Line Items]
Redemption Price In Percentage	103.25%
Period Commencing March 1, 2018 [Domain]
Debt Instrument [Line Items]
Redemption Price In Percentage	101.625%
Period Commencing March 1, 2019 [Domain]
Debt Instrument [Line Items]
Redemption Price In Percentage	100.00%
Period Prior to March 1, 2016 [Member]
Debt Instrument [Line Items]
Redemption Price In Percentage Plus A Make-Whole Premium	100.00%