Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2021		242,778
Beginning balance at Dec. 31, 2021	$ 22,837	$ 2	$ 19,123	$ (248)	$ 3,960
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(922)				(922)
Conversion premium
Exercise of stock options and employee stock purchases (in shares)		6
Exercise of stock options and employee stock purchases	1			1
Purchases of treasury stock (in shares)		(1,175)
Purchases of treasury stock	(276)			(276)
Stock-based compensation:
Vested compensation awards, net or issued awards (in shares)		350
Vested compensation awards, net	0
Compensation costs included in net income (loss)	19		19
Net income (loss)	2,009				2,009
Ending balance (in shares) at Mar. 31, 2022		241,959
Ending balance at Mar. 31, 2022	23,668	$ 2	19,142	(523)	5,047
Beginning balance (in shares) at Dec. 31, 2022		236,036
Beginning balance at Dec. 31, 2022	22,541	$ 2	18,779	(1,925)	5,685
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(1,314)				(1,314)
Conversion premium
Conversion premium	(138)		(138)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	31		31
Issuance fees and deferred taxes	(7)		(7)
Purchases of treasury stock (in shares)		(2,499)
Purchases of treasury stock	(520)			(520)
Stock-based compensation:
Vested compensation awards, net or issued awards (in shares)		199
Vested compensation awards, net	0
Compensation costs included in net income (loss)	23		23
Net income (loss)	1,222				1,222
Ending balance (in shares) at Mar. 31, 2023		233,736
Ending balance at Mar. 31, 2023	$ 21,838	$ 2	$ 18,688	$ (2,445)	$ 5,593