CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED OTHER COMPREHENSIVE LOSS	ACCUMULATED DEFICIT	ACCUMULATED DEFICIT Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period at Dec. 31, 2018		$ 1,080	$ 22,852	$ (2,461)	$ (1,643)	$ 96
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock through dividend reinvestment, incentive and benefit plans		10
Repurchases of common stock		0	0
Shares withheld to satisfy tax withholdings			(37)
Stock-based compensation and other, net			163
Dividends declared			(1,104)		2
Other comprehensive income (loss)	$ (219)			(219)
Net income (loss)	(5,269)				(5,269)
Balance at end of period at Dec. 31, 2019	$ 13,470	1,090	21,874	(2,680)	(6,814)	$ 9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 1.00
Accounting Standards Update [Extensible List]						Accounting Standards Update 2016-13 [Member]
Issuance of common stock through dividend reinvestment, incentive and benefit plans		7
Repurchases of common stock		0	0
Shares withheld to satisfy tax withholdings			(40)
Stock-based compensation and other, net			187
Dividends declared			(1,112)		6
Other comprehensive income (loss)	$ (133)			(133)
Net income (loss)	(1,232)				(1,232)
Balance at end of period at Dec. 31, 2020	$ 11,162	1,097	20,909	(2,813)	(8,031)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 1.00
Issuance of common stock through dividend reinvestment, incentive and benefit plans		8
Repurchases of common stock	$ (1,000)	(81)	(919)
Shares withheld to satisfy tax withholdings			(45)
Stock-based compensation and other, net			122
Dividends declared			(1,095)		0
Other comprehensive income (loss)	655			655
Net income (loss)	2,033				2,033
Balance at end of period at Dec. 31, 2021	$ 11,840	$ 1,024	$ 18,972	$ (2,158)	$ (5,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 1.00