Equity - Narrative (Details) $ / shares in Units, $ in Millions				1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 04, 2024 $ / shares	Mar. 15, 2024 USD ($) $ / shares shares	Mar. 14, 2019 USD ($) $ / shares shares	Oct. 30, 2024 USD ($) shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares	Apr. 30, 2024 USD ($)	Dec. 31, 2023 $ / shares
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares					$ 5.00		$ 5.00			$ 5.00
Proceeds from redemption of preferred stock | $							$ 485	$ 0
Redemption premium realized | $		$ 15
Outstanding par and additional paid in capital amount of preferred stock | $		$ 485					$ 485
Common stock, par value (in dollars per share) | $ / shares					$ 2.50		$ 2.50			$ 2.50
Authorized repurchase amount | $									$ 10,000
Remaining authorized repurchase amount | $									$ 3,900
Shares purchased (in shares) | shares							65,200,000
Aggregate repurchases of common stock | $					$ 1,518	$ 794	$ 4,877	$ 1,959
Dividends declared, common stock (in dollars per share) | $ / shares					$ 0.40	$ 0.36	$ 1.16	$ 1.04
Subsequent event
Class of Stock [Line Items]
Shares purchased (in shares) | shares				7,000,000
Aggregate repurchases of common stock | $				$ 500
Dividends declared, common stock (in dollars per share) | $ / shares	$ 0.40
Series A Preferred Stock
Class of Stock [Line Items]
Issuances (in shares) | shares			20,000
Preferred stock, dividend rate (as a percent)			5.85%
Preferred stock, par value (in dollars per share) | $ / shares			$ 5.00
Preferred stock liquidation preference (in dollars per share) | $ / shares			$ 25,000
Issuance of preferred stock | $			$ 485
Stock redeemed during the period (in shares) | shares		20,000
Preferred stock redemption price per share (in USD per share) | $ / shares		$ 25,000
Proceeds from redemption of preferred stock | $		$ 500
Series A Depositary Shares
Class of Stock [Line Items]
Issuances (in shares) | shares			20,000,000
Depository shares, equity interest in preferred stock (as a percent)			0.001
Preferred stock liquidation preference (in dollars per share) | $ / shares			$ 25
Stock redeemed during the period (in shares) | shares		20,000,000
Preferred stock redemption, depository shares equity interest in preferred stock (as a percent)		0.001
Preferred stock redemption price per share (in USD per share) | $ / shares		$ 25.00