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Debt and Credit Agreements - Narrative (Details) | 3 Months Ended |
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Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) swap | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) swap | Dec. 31, 2020 USD ($)
Line of Credit Facility |  |  |  |  |  |  |
Other operating activities | $ (15,000,000) |  |  |  | $ (31,000,000) |  |
Commercial Paper |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility | 1,000,000,000 |  |  |  |  |  |
Borrowings outstanding | 0 |  |  |  |  |  |
Fixed Rate Notes Due Between 2036 and 2040 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt issued | 1,050,000,000 | $ 1,050,000,000 |  |  |  | $ 800,000,000 |
3.25% Notes Due 2027 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 850,000,000
Debt interest rate |  |  |  |  |  |  | 3.25%
Unsecured Revolving Credit Facility Due 2028 | Credit Facility |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility | 1,200,000,000 |  |  |  |  |  |
Borrowings outstanding | 0 |  |  |  |  |  |
Fixed Rate Notes Due 2033 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt issued |  | $ 250,000,000 |  |  |  |  |
Fixed-to-Floating Interest Rate Swap | Fair Value Hedging |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Derivative, number of fair value hedges | swap |  |  |  |  |  | 5 |
Derivative, term of contract (in years) |  |  |  |  |  | 10 years |
Two Separate Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Derivative, number of fair value hedges | swap |  | 2 |  |  |  |  |
Derivative, term of contract (in years) |  | 10 years |  |  |  |  |
Designated as Hedging Instrument | Fixed-to-Floating Interest Rate Swap | Fair Value Hedging |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Fair value hedge derivative instrument liabilities at fair value | 131,000,000 | $ 107,000,000 |  |  |  |  |
Designated as Hedging Instrument | Forward Starting Interest Rate Swap | Cash Flow Hedge |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Cash flow hedge derivative instrument assets at fair value | 51,000,000 | 48,000,000 |  |  |  |  |
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedge |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Aggregate notional value of interest forward interest rate swap | 114,000,000 | 114,000,000 |  |  |  |  | $ 500,000,000
Cash flow hedge derivative instrument assets at fair value | 51,000,000 | 48,000,000 |  |  |  |  |
Derivative asset, notional amount settled |  |  | $ 113,000,000 | $ 113,000,000 |  |  |
Other operating activities |  |  | $ 51,000,000 | $ 44,000,000 |  |  |
Designated as Hedging Instrument | Two Separate Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Interest rate fair value hedge asset at fair value | $ 11,000,000 | $ 19,000,000 |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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