Debt (Long-Term Debt) (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
Sep. 30, 2018	Feb. 01, 2025
Notes Due 2028 [Member]
Debt Instrument [Line Items]
Principal amount		$ 500,000,000
Debt issuance costs	$ 5,000,000
Proceeds from debt, net of issuance costs	$ 495,000,000
Redemption price, percentage		100.00%
Control triggering percentage		101.00%
Interest rate		4.45%
Notes Due 2030 [Member]
Debt Instrument [Line Items]
Principal amount		$ 650,000,000
Unamortized discount		8,000,000
Proceeds from debt, net of issuance costs		$ 642,000,000
Redemption price, percentage		100.00%
Control triggering percentage		101.00%
Interest rate		1.95%

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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