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Debt and Credit Agreements - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |
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Sep. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) swap | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jul. 28, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jul. 09, 2020 USD ($)
Commercial Paper |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility | $ 1,000,000,000 |  |  | $ 1,000,000,000 |  |  |  |
Borrowings outstanding | 0 |  |  | 0 |  |  |  |
4.1% Notes Due 2032 |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 950,000,000 |  |
Debt interest rate |  |  |  |  |  | 4.10% |  |
4.5% Notes Due 2052 |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 900,000,000 |  |
Debt interest rate |  |  |  |  |  | 4.50% |  |
4.65% Notes Due 2068 |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 150,000,000 |  |
Debt interest rate |  |  |  |  |  | 4.65% |  |
Fixed Rate Notes Due Between 2036 and 2040 |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Debt issued | 800,000,000 | $ 800,000,000 |  | 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 Expiring March 2024 | Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility | 1,200,000,000 |  |  | 1,200,000,000 |  |  |  |
Borrowings outstanding | 0 |  |  | 0 |  |  |  |
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 |  | 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 | 120,000,000 |  |  | 120,000,000 |  |  |  |
Designated as Hedging Instrument | Forward Starting Interest Rate Swap | Cash Flow Hedge |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Aggregate notional value of interest forward interest rate swap | 173,000,000 |  |  | 173,000,000 |  |  | $ 91,000,000 | $ 500,000,000
Cash flow hedge derivative instrument assets at fair value | 173,000,000 |  |  | 173,000,000 |  |  | $ 91,000,000 |
Unrealized gains (losses) recorded net of tax in other comprehensive income related to hedge | $ 9,000,000 |  | $ 7,000,000 | $ 63,000,000 | $ 28,000,000 |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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