Debt (2022 Credit Facility - Narrative) (Details) $ in Millions		9 Months Ended	12 Months Ended
	Aug. 04, 2022 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 04, 2023 USD ($)	Dec. 22, 2021
Debt Instrument [Line Items]
Subsidiary ownership		100.00%
2022 Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.375%		0.15%
2022 Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.50%		0.275%
Ratio of indebtedness to net capital					0.65
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 3,500
Line of credit facility, increase, net	$ 500
Minimum current ratio	1.00
Leverage ratio, percentage of credit limit	10.00%
Leverage ratio, amount of credit limit	$ 150
Letters of credit		0
Debt Instrument		$ 388	$ 250
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Aggregate commitment				$ 3,500
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | On Or After March 31, 2022
Debt Instrument [Line Items]
Leverage ratio	4.00
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis points	0.10%		0.10%
Debt instrument, discount coverage ratio			9.00%
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis points	0.50%
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Base Rate
Debt Instrument [Line Items]
Basis points	1.00%
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Minimum | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis points	1.75%		1.25%
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Minimum | Base Rate
Debt Instrument [Line Items]
Basis points	0.75%		0.25%
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Maximum | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis points	2.75%		1.875%
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Maximum | Base Rate
Debt Instrument [Line Items]
Basis points	1.75%		0.875%
Revolving Credit Facility | 2022 Revolving Credit Facility | Long-term debt
Debt Instrument [Line Items]
Minimum interest coverage ratio			1.50
Revolving Credit Facility | 2022 Revolving Credit Facility Five-Year Tranche | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, expiration period		5 years
Aggregate commitment		$ 2,000
Revolving Credit Facility | 2022 Revolving Credit Facility Five-Year Tranche | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Aggregate commitment				$ 2,000