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Debt - Short-term and Long-term Debt by Issuance (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2017	Dec. 31, 2022	Apr. 15, 2022	Dec. 31, 2021
Schedule of Debt [Line Items]
Revolving Credit Facilities		$ 0		$ 0
Total Notes and Debentures		4,482		5,082
Unamortized discount and debt issuance cost [2]		125		138
Total Debt		4,357		4,944
Less: Current maturities		0		0
Long-Term Debt		$ 4,357		4,944
Derivative, Fixed Interest Rate		4.39%
Interest rate derivatives
Schedule of Debt [Line Items]
Derivative, Maturity Date		Feb. 15, 2027
2.8% Notes, due 2029
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.80%
Senior Notes and Debentures		$ 600		600
5.95% Notes, due 2036
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.95%
Senior Notes and Debentures		$ 300		300
6.625% Notes, due 2040
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.625%
Senior Notes and Debentures		$ 295		295
6.1% Notes, due 2041
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.10%
Senior Notes and Debentures		$ 409		409
Debt Instrument, Unamortized Discount		$ 72		74
6.625% Notes, due 2042
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.625%
Senior Notes and Debentures		$ 178		178
4.3% Notes, due 2043
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.30%
Senior Notes and Debentures		$ 300		300
4.4% Notes, due 2048
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.40%
Senior Notes and Debentures		$ 500		500
3.6% Notes, due 2049
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.60%
Senior Notes and Debentures		$ 800		800
2.9% Notes, due 2051
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.90%
Senior Notes and Debentures		$ 600		600
7.875% Notes, due 2042
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.875%	7.875%
Junior Subordinated Debentures		$ 0		600
LIBOR Plus Two Point One Two Five Percent Junior Subordinated Notes Due Two Thousand Sixty Seven [Member]
Schedule of Debt [Line Items]
Junior Subordinated Debentures		$ 500		$ 500
LIBOR Plus Two Point One Two Five Percent Junior Subordinated Notes Due Two Thousand Sixty Seven [Member] | Interest Rate Subsequent to Call Date [Member]
Schedule of Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.125%	2.125%
Senior Note Two Point Nine Percent Due In Twenty Fifty One
Schedule of Debt [Line Items]
Debt Instrument, Interest Rate, Increase (Decrease)		20.00%

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- Definition

Adjustment to long-term debt as listed in the schedule of debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Fixed interest rate related to the interest rate derivative.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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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.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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