Consolidated Statements of Changes in Common Shareholders' Equity (Unaudited) - USD ($) $ in Millions		Common Stock [Member]	Treasury Stock, Common [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	[1]	Total
Balance (in shares) at Dec. 31, 2022		1,112,600,000	(500,200,000)
Balance at Dec. 31, 2022		$ 2,782	$ (54,004)	$ 5,080	$ 58,887	$ (582)		$ 12,163
Net income		0	0	0	1,630	0		1,630
Other comprehensive income/(loss)		$ 0	$ 0	0	0	22		22	[2]
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares)	[3]	300,000	100,000
Conversion, stock option exercises, forfeitures, ESPP, and other [b]	[3]	$ 0	$ 4	19	0	0		$ 23
Share repurchase programs (Note 15) (in shares)			(2,900,000)					(2,908,703)
Share repurchase programs (Note 15)		0	$ (591)	0	0	0		$ (591)
Dividends declared ($1.30 per share)		$ 0	$ 0	0	(793)	0		(793)
Balance (in shares) at Mar. 31, 2023		1,112,900,000	(503,000,000)
Balance at Mar. 31, 2023		$ 2,782	$ (54,591)	5,099	59,724	(560)		12,454
Balance (in shares) at Dec. 31, 2023		1,112,900,000	(503,200,000)
Balance at Dec. 31, 2023		$ 2,782	$ (54,666)	5,193	62,093	(614)		14,788
Net income		0	0	0	1,641	0		1,641
Other comprehensive income/(loss)		$ 0	$ 0	0	0	4		4	[2]
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares)	[3]	100,000	200,000
Conversion, stock option exercises, forfeitures, ESPP, and other [b]	[3]	$ 1	$ 5	20	0	0		$ 26
Share repurchase programs (Note 15) (in shares)			0					0
Share repurchase programs (Note 15)		0	$ 0	0	0	0		$ 0
Dividends declared ($1.30 per share)		$ 0	$ 0	0	(794)	0		(794)
Balance (in shares) at Mar. 31, 2024		1,113,000,000	(503,000,000)
Balance at Mar. 31, 2024		$ 2,783	$ (54,661)	$ 5,213	$ 62,940	$ (610)		$ 15,665

[1] AOCI = accumulated other comprehensive income/loss (Note 8)

[2] Net of deferred taxes of ($0) million during both the three months ended March 31, 2024 and 2023.

[3] ESPP = employee stock purchase plan