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Senior Notes (Narrative) (Details)				1 Months Ended	3 Months Ended		4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021 USD ($)	Feb. 05, 2021	Aug. 18, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2012 USD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 25, 2020 USD ($)	Mar. 04, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018
Debt Instrument [Line Items]
Long-term Debt	$ 544,800,000						$ 544,800,000
Debtor-in-Possession Financing, Amount Arranged															$ 500,000,000
Debtor-in-Possession Financing, Borrowings Outstanding								$ 0	$ 0	$ 0
Liabilities Subject to Compromise	0						0	0	0	7,313,700,000
Backstop Commitment Agreement, Backstop Premium							(30,000,000.0)	0		0
BackstopCommitmentAgreementCashSettlement			$ 520,000,000
BackstopCommitmentAgreementNoteIssued			550,000,000
BackstopCommitmentAgreementSharesToBeAllocated		2.70%
Liabilities Subject To Compromise, Accrued Interest On Notes								203,500,000	203,500,000	201,900,000
Debt Instrument, Convertible, Carrying Amount of Equity Component										220,000,000
Debt Instrument, Repurchased Face Amount				$ 12,800,000				951,800,000	951,800,000	951,800,000
Debt Instrument, Repurchase Amount				9,700,000				724,100,000	$ 724,100,000	724,100,000
Gain (Loss) on Extinguishment of Debt				$ 3,100,000			0	0		3,100,000	$ 194,100,000
Debentures Due 2027
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage									100.00%
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								545,300,000	$ 545,300,000	7,096,300,000
Liabilities Subject to Compromise								$ 0	$ 0	$ 7,096,300,000
7.38%SeniorNotesDue2025 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								7.375%	7.375%
5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								5.40%	5.40%
5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								5.85%	5.85%
3.00% Exchangeable senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								3.00%	3.00%
4.875%SeniorNotesDue2022Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								4.875%	4.875%
4.75%SeniorNotesDue2024Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								4.75%	4.75%
7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								7.75%	7.75%
5.20% Senior notes due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								5.20%	5.20%
5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								5.75%	5.75%
4.50% Senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								4.50%	4.50%
4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								4.70%	4.70%
6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								6.875%	6.875%
7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								7.875%	7.875%
7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								7.20%	7.20%
8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								8.00%	8.00%
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024
Debt Instrument [Line Items]
Conversion rate per $1,000 principal amount of shares										17.8336
Debt Instrument, Convertible, Conversion Price | $ / shares										$ 56.08
Interest Expense, Debt, Excluding Amortization									$ 16,100,000		25,500,000
Amortization of Debt Issuance Costs and Discounts									21,400,000	$ 32,500,000
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								$ 0	$ 0	849,500,000
Convertible Debt [Member] | Three percent exchangeable senior notes due twenty twenty four [Member] | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt										849,500,000
Senior Notes [Member]
Debt Instrument [Line Items]
Backstop Commitment Agreement, Backstop Premium			50,000,000
BackstopCommitmentAgreementCommitmentFee			$ 20,000,000
Senior Notes [Member] | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Liabilities Subject to Compromise										6,500,000,000
Senior Notes [Member] | 7.38%SeniorNotesDue2025 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								7.375%	7.375%
Debt Instrument, Face Amount								$ 500,000,000	$ 500,000,000
Debt Instrument, Repurchased Face Amount								139,200,000	139,200,000
Debt Instrument, Repurchase Amount								109,200,000	109,200,000
Senior Notes [Member] | 7.38%SeniorNotesDue2025 [Member] | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	360,800,000
Senior Notes [Member] | 5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								400,000,000	400,000,000
Senior Notes [Member] | 5.40%SeniorNotesDue2042 [Member] | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								$ 0	$ 0	400,000,000.0
Senior Notes [Member] | 5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								5.85%	5.85%
Debt Instrument, Face Amount								$ 400,000,000	$ 400,000,000
Senior Notes [Member] | 5.85%SeniorNotesDue2044 [Member] | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								$ 0	$ 0	400,000,000.0
Senior Notes [Member] | 7.875% Senior Notes Due 2040 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								7.875%	7.875%
Debt Instrument, Face Amount								$ 201,400,000	$ 201,400,000
Senior Notes [Member] | 4.875%SeniorNotesDue2022Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								4.875%	4.875%
Debt Instrument, Face Amount								$ 620,800,000	$ 620,800,000
Senior Notes [Member] | 4.875%SeniorNotesDue2022Member [Member] | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								$ 0	$ 0	620,800,000
Senior Notes [Member] | 4.75%SeniorNotesDue2024Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								4.75%	4.75%
Debt Instrument, Face Amount								$ 398,100,000	$ 398,100,000
Debt Instrument, Repurchased Face Amount								79,500,000	79,500,000
Debt Instrument, Repurchase Amount								61,200,000	61,200,000
Senior Notes [Member] | 4.75%SeniorNotesDue2024Member [Member] | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	318,600,000
Senior Notes [Member] | 7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage																		7.75%
Debt Issuance Costs, Gross																	$ 16,500,000
Debt Instrument, Face Amount											$ 1,000,000,000
Senior Notes [Member] | 7.75% Senior notes due 2026 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	1,000,000,000
Senior Notes [Member] | 5.20% Senior notes due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage													5.20%
Debt Instrument, Face Amount													$ 700,000,000
Senior Note Maturity Year													2025
Debt Instrument, Unamortized Discount (Premium), Net													$ 2,600,000
Debt Instrument, Repurchased Face Amount								335,500,000	335,500,000
Debt Instrument, Repurchase Amount								250,000,000.0	250,000,000.0
Senior Notes [Member] | 5.20% Senior notes due 2025 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	333,700,000
Senior Notes [Member] | 5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage													5.75%	5.75%
Debt Instrument, Face Amount													$ 400,000,000	$ 625,000,000
Senior Note Maturity Year													2044	2044
Debt Instrument, Unamortized Discount (Premium), Net													$ 18,700,000	$ 2,800,000
Senior Notes [Member] | 5.75% Senior notes due 2044 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	1,000,500,000
Senior Notes [Member] | 4.50% Senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage														4.50%
Debt Instrument, Face Amount														$ 625,000,000
Senior Note Maturity Year														2024
Debt Instrument, Unamortized Discount (Premium), Net														$ 900,000
Debt Instrument, Repurchased Face Amount								320,000,000.0	320,000,000.0
Debt Instrument, Repurchase Amount								240,000,000.0	240,000,000.0
Senior Notes [Member] | 4.50% Senior notes due 2024 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	303,400,000
Senior Notes [Member] | 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						4.70%
Debt Instrument, Face Amount						$ 1,500,000,000
Senior Note Maturity Year						2021
Debt Instrument, Unamortized Discount (Premium), Net						$ 29,600,000
Debt Instrument, Repurchased Face Amount																$ 12,800,000
Debt Instrument, Repurchase Amount																$ 9,700,000
Senior Notes [Member] | 4.70% Senior notes due 2021 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	100,700,000
Senior Notes [Member] | 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					6.875%
Debt Instrument, Face Amount					$ 900,000,000
Senior Note Maturity Year					2020
Senior Notes [Member] | 6.875% Senior notes due 2020 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	122,900,000
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					8.50%
Debt Instrument, Face Amount					$ 500,000,000
Senior Note Maturity Year					2019
Senior Notes [Member] | 7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 300,000,000
Senior Notes [Member] | 7.875% Senior notes due 2040 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								0	0	$ 300,000,000.0
Senior Notes [Member] | 7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage										7.20%
Debt Instrument, Face Amount										$ 150,000,000
Debt Instrument, Repurchased Face Amount								37,900,000	37,900,000
Debt Instrument, Repurchase Amount								29,900,000	29,900,000
Senior Notes [Member] | 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage												8.00%
Debt Instrument, Face Amount												$ 332,000,000
Senior Note Maturity Year												2024
Debt Instrument, Repurchased Face Amount								39,700,000	39,700,000
Debt Instrument, Repurchase Amount								33,800,000	33,800,000
Senior Notes [Member] | 8.00% Senior notes due 2024 | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt								$ 0	$ 0	$ 292,300,000
Senior Notes [Member] | First Lien Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	550,000,000						550,000,000
Debtor-in-Possession Financing, Amount Arranged	$ 520,000,000						$ 520,000,000
DebtInstrumentPercentSecuredEquityInterest	100.00%
DebtInstrumentInterestRateAnnualPaymentPercent	10.25%
DebtInstrumentAllowableRedemptionPercentPriorToMaturity	35.00%						35.00%
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	104.00%
DebtInstrumentPercentOfNoteRemainingOutstanding	65.00%
DebtInstrumentRedemptionPeriodTiming	12000.00%
Senior Notes [Member] | First Lien Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	104.00%
Senior Notes [Member] | First Lien Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	100.00%
Senior Notes [Member] | First Lien Notes | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	101.00%
Senior Notes [Member] | First Lien Notes | Debt Instrument Interest Rate Payout Option One Member
Debt Instrument [Line Items]
DebtInstrumentInterestRateAnnualPaymentPercent	8.25%
Senior Notes [Member] | First Lien Notes | Debt Instrument Interest Rate Payout Option Two Member
Debt Instrument [Line Items]
DebtInstrumentAnnualInterestPayoutPercentInCash	50.00%
DebtInstrumentAnnualInterestPayoutPercentPaidInKind	50.00%
DebtInstrumentInterestRateAnnualPaymentPercentPaidInKind	12.00%

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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