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Pension and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended
	Apr. 30, 2021	Jan. 31, 2021	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost			$ 3		$ 5	$ 12	$ 16
Interest cost			18		15	51	48
Expected return on plan assets			(21)		(24)	(68)	(84)
Recognized net actuarial loss			18		19	56	75
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			15		5	16	573
Amortization of prior service benefit			1		0	2	0
Net periodic benefit cost			34		20	69	628
Pension benefits \| UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax							549
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			15		5	15	24
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 250	$ 200	7	$ 7
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan							549
Other postretirement benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost			1		2	3	5
Interest cost			2		3	8	8
Recognized net actuarial loss			2		2	6	7
Amortization of prior service benefit			(2)		(2)	(6)	(5)
Net periodic benefit cost			$ 3		$ 5	$ 11	$ 15