Financing Arrangements and Derivative Financial Instruments - Senior Notes Narrative (Details) € in Millions, $ in Millions			12 Months Ended
	Jan. 14, 2016	Dec. 07, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2014
6.75% Euro Notes due 2019 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, principal amount | €				€ 250
Interest rate, stated percentage			6.75%	6.75%	6.75%
8.25% due 2020 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 1,000
Interest rate, stated percentage		8.25%	8.25%	8.25%	8.25%
Redemption premium		$ 41	$ 41
Write-off of deferred financing fees and unamortized discount		$ 14	14
8.75% due 2020 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 282
Interest rate, stated percentage			8.75%	8.75%	8.75%
Debt instrument, maturity date			Aug. 15, 2020
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 secured debt, (ii) engage in sale and leaseback transactions, and (iii) consolidate, merge, sell or otherwise dispose of all or substantially all of our assets. These covenants are subject to significant exceptions and qualifications.
Interest rate, effective percentage			9.20%	9.20%
6.5% due 2021 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 900
Interest rate, stated percentage			6.50%	6.50%	6.50%
Notes sold at as a percentage of principle amount			100.00%	100.00%
Debt instrument, maturity date			Mar. 01, 2021
Percent of notes that may be redeemed with certain equity offerings			35.00%
7% due 2022 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 700
Interest rate, stated percentage			7.00%	7.00%	7.00%
Notes sold at as a percentage of principle amount			100.00%	100.00%
Debt instrument, maturity date			May 15, 2022
5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 1,000
Interest rate, stated percentage			5.125%	5.125%	5.125%
Notes sold at as a percentage of principle amount			100.00%	100.00%
Percent of notes that may be redeemed with certain equity offerings			35.00%
3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, principal amount | €				€ 250
Interest rate, stated percentage			3.75%	3.75%	3.75%
Notes sold at as a percentage of principle amount			100.00%	100.00%
Percent of notes that may be redeemed with certain equity offerings			35.00%
7% due 2028 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 150
Interest rate, stated percentage			7.00%	7.00%	7.00%
Debt instrument, maturity date			Mar. 15, 2028
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 secured debt, (ii) engage in sale and leaseback transactions, and (iii) consolidate, merge, sell or otherwise dispose of all or substantially all of our assets. These covenants are subject to significant exceptions and qualifications.
Period Commencing March 1, 2016 | 6.5% due 2021 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			104.875%
Period Commencing March 1, 2017 | 6.5% due 2021 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			103.25%
Period Commencing March 1, 2018 | 6.5% due 2021 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			101.625%
Period Commencing March 1, 2019 | 6.5% due 2021 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Period Prior to March 1, 2016 | 6.5% due 2021 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Redemption price as percentage of principal amount plus accrued and unpaid interest			106.50%
Period Commencing May 15, 2017 | 7% due 2022 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			103.50%
Period Commencing May 15, 2018 | 7% due 2022 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			102.333%
Period Commencing May 15, 2019 | 7% due 2022 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			101.167%
Period Commencing May 15, 2020 | 7% due 2022 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Period Prior to May 15, 2017 | 7% due 2022 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Period Commencing November 15, 2018 | 5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			102.563%
Period Commencing November 15, 2019 | 5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			101.281%
Period Commencing November 15, 2020 | 5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Period Prior to November 15, 2018 | 5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Redemption price as percentage of principal amount plus accrued and unpaid interest			105.125%
Period Commencing December 15, 2018 | 3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			101.875%
Period Commencing December 15, 2019 | 3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.938%
Period Commencing December 15, 2020 | 3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Period Prior to December 15, 2018 | 3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Redemption price as percentage of principal amount plus accrued and unpaid interest			103.75%
At Any Time Plus Make Whole Premium | 8.75% due 2020 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
At Any Time Plus Make Whole Premium | 7% due 2028 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Subsequent Event | 6.75% Euro Notes due 2019 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	103.375%
Treasury Rate | 8.75% due 2020 | Senior Notes
Debt Instrument [Line Items]
Basis spread			0.50%