Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (loss)	Treasury Stock	Noncontrolling Interests
Balances (in shares) at Dec. 31, 2020		198,649
Balances at Dec. 31, 2020	$ 13,728	$ 33	$ 2,705	$ 20,517	$ 391	$ (9,918)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,947			2,947
Acquisition	22						22
Other comprehensive loss	(246)				(246)
Common stock repurchases	(36)		263			(299)
Dividends and dividend equivalents	(273)			(273)
Stock-based compensation	132		132
Restricted stock unit vesting	0		(40)			40
Stock option exercises	8		4			4
Balances (in shares) at Sep. 30, 2021		198,649
Balances at Sep. 30, 2021	16,282	$ 33	3,064	23,191	145	(10,173)	22
Balances (in shares) at Jun. 30, 2021		198,649
Balances at Jun. 30, 2021	14,843	$ 33	3,018	21,751	216	(10,175)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,531			1,531
Acquisition	22						22
Other comprehensive loss	(71)				(71)
Common stock repurchases	(3)					(3)
Dividends and dividend equivalents	(91)			(91)
Stock-based compensation	48		48
Restricted stock unit vesting	0		(3)			3
Stock option exercises	3		1			2
Balances (in shares) at Sep. 30, 2021		198,649
Balances at Sep. 30, 2021	16,282	$ 33	3,064	23,191	145	(10,173)	22
Balances (in shares) at Dec. 31, 2021		198,649
Balances at Dec. 31, 2021	16,103	$ 33	3,082	23,086	42	(10,163)	23
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,820			2,821			(1)
Distribution from (to) noncontrolling interest holders, net	(1)						(1)
Sale of KAH Hospice	(11)						(11)
Acquisition	53						53
Other comprehensive loss	(1,509)				(1,509)
Common stock repurchases	(1,032)					(1,032)
Dividends and dividend equivalents	(301)			(301)
Stock-based compensation	173		173
Restricted stock unit vesting (in shares)		18
Restricted stock unit vesting	0		(31)			31
Stock option exercises	22		10			12
Balances (in shares) at Sep. 30, 2022		198,667
Balances at Sep. 30, 2022	16,317	$ 33	3,234	25,606	(1,467)	(11,152)	63
Balances (in shares) at Jun. 30, 2022		198,667
Balances at Jun. 30, 2022	15,510	$ 33	3,153	24,511	(1,051)	(11,156)	20
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,193			1,195			(2)
Distribution from (to) noncontrolling interest holders, net	3						3
Sale of KAH Hospice	(11)						(11)
Acquisition	53						53
Other comprehensive loss	(416)				(416)
Common stock repurchases	(4)					(4)
Dividends and dividend equivalents	(100)			(100)
Stock-based compensation	80		80
Restricted stock unit vesting	0		(3)			3
Stock option exercises	9		4			5
Balances (in shares) at Sep. 30, 2022		198,667
Balances at Sep. 30, 2022	$ 16,317	$ 33	$ 3,234	$ 25,606	$ (1,467)	$ (11,152)	$ 63