Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Estimated Fair Value of Financial Instruments, by Balance Sheet Grouping

The fair value of financial instruments has been estimated by the Company using available market information as of June 30, 2021 and December 31, 2020, and valuation methodologies considered appropriate. The estimates presented in the table below are not necessarily indicative of amounts the Company could realize in a current market exchange (in millions):

	June 30, 2021				December 31, 2020
	Carrying		Estimated Fair		Carrying		Estimated Fair
	Amount		Value		Amount		Value
Assets:
Cash and cash equivalents	$	1,250	$	1,250	$	1,676	$	1,676
Investments in equity securities		127		127		129		129
Available-for-sale debt securities		138		138		110		110
Trading securities		12		12		12		12
Liabilities:
6⅞% Senior Notes due 2022		—		—		125		125
6¼% Senior Secured Notes due 2023		—		—		95		99
8⅝% Senior Secured Notes due 2024		—		—		1,025		1,080
6⅝% Senior Secured Notes due 2025		1,430		1,545		1,427		1,543
8% Senior Secured Notes due 2026		2,076		2,268		2,074		2,275
8% Senior Secured Notes due 2027		692		779		692		760
5⅝% Senior Secured Notes due 2027		1,813		2,029		1,809		2,048
6⅞% Senior Notes due 2028		758		761		758		618
6% Senior Secured Notes due 2029		858		965		857		973
4¾% Senior Secured Notes due 2031		1,090		1,098		—		—
9⅞% Junior-Priority Secured Notes due 2023		—		—		1,756		1,861
8⅛% Junior-Priority Secured Notes due 2024		—		—		1,336		1,408
6⅞% Junior-Priority Secured Notes due 2029		1,618		1,865		—		—
6⅛% Junior-Priority Secured Notes due 2030		1,348		1,460		—		—
ABL Facility and other debt		21		21		23		23