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Debt (Narrative) (Long-Term Debt) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2011 | Jan. 30, 2021
Debt Instrument [Line Items] |  |  |
2022 |  |  | $ 0
2023 |  |  | 0
2024 |  |  | 0
2025 |  |  | 0
2026 |  |  | 0
Notes due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 650,000,000
Interest rate |  |  | 5.50%
Debt Issuance Costs, Gross |  | $ 4,000,000 |
Proceeds from Debt, Net of Issuance Costs |  | $ 644,000,000 |
Notes due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 500,000,000
Interest rate |  |  | 4.45%
Debt Issuance Costs, Gross | $ 5,000,000 |  |
Proceeds from Debt, Net of Issuance Costs | $ 495,000,000 |  |
Debt Instrument, Redemption Price, Percentage |  |  | 100.00%
Debt Instrument, Redemption Price, Control Triggering Percentage |  |  | 101.00%
Notes Due 2030 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 650,000,000
Interest rate |  |  | 1.95%
Debt Instrument, Unamortized Discount |  |  | $ 8,000,000
Proceeds from Debt, Net of Issuance Costs |  |  | $ 642,000,000
Debt Instrument, Redemption Price, Percentage |  |  | 100.00%
Debt Instrument, Redemption Price, Control Triggering Percentage |  |  | 101.00%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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