EBPs Funded Status (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Contribution Plan
Percentage of eligible compensation the employer will match of employee contributions		6.00%
Employer's contributions charged to expense under defined contribution plan		$ 53	$ 45	$ 42
Pension Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year		1,133	1,183
Service cost		28	30	31
Interest cost		31	28	36
Plan participants’ contributions		0	0
Benefits paid		(78)	(83)
Net actuarial loss (gain) (1)	[1]	(162)	(21)
Settlements		(12)	(4)
Net increase (decrease) in benefit obligation		(193)	(50)
Benefit obligation at end of year		940	1,133	1,183
Other Postretirement Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year		200	220
Service cost		1	1	1
Interest cost		6	5	7
Plan participants’ contributions		2	2
Benefits paid		(12)	(14)
Net actuarial loss (gain) (1)	[1]	(45)	(14)
Settlements		0	0
Net increase (decrease) in benefit obligation		(48)	(20)
Benefit obligation at end of year		$ 152	$ 200	$ 220

[1] 2022 amounts are due primarily to the following factors: Pension benefits - discount rate assumptions, partially offset by change in interest crediting rate assumption; Other Postretirement Benefits - discount rate assumption. 2021 amounts are due primarily to the following factors: Pension Benefits - discount rate assumptions, partially offset by experience-related items; Other Postretirement Benefits - discount rate assumption and experience-related items.