Employee Benefit Plans - Allocation of Plan Assets (Details) - Fair Value, Recurring - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	$ 608	$ 482
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	6	100
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	27	43
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	1
Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	40
Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Fixed income securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	312	137
Fixed income securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	86
Fixed income securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	0	0
Other investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	269	301
Other investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	6	(26)
Other investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total investments at fair value	$ 0	$ 0