Income Taxes - Summary of Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Earnings before income taxes	$ 586		$ 534	$ 1,859	$ 793
Income tax expense computed at United States statutory tax rate	123		112	390	167
State and local taxes, net of federal tax benefit	17		15	49	22
Valuation allowances	3		6	5	12
Audit and settlements	(32)		14	(17)	31
U.S. foreign income items, net of credits	(1)		(2)	(1)	(1)
Changes in enacted tax rates	0		(6)	(14)	(6)
Divestiture tax impact	(1)	$ (21)	0	(22)	0
Legal entity restructuring tax impact	0		0	(46)	0
Other	(9)		2	9	6
Income tax expense (benefit) computed at effective worldwide tax rates	$ 100		$ 141	$ 353	$ 231