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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, 2020 | Dec. 31, 2019
Schedule of Debt [Line Items] |  |  |
Revolving Credit Facilities |  | $ 0 | $ 0
Total Notes and Debentures |  | 4,482 | 4,982
Unamortized discount and debt issuance cost [2] |  | 130 | 134
Total Debt |  | 4,352 | 4,848
Less: Current maturities |  | 0 | 500
Long-Term Debt |  | $ 4,352 | 4,348
Derivative, Fixed Interest Rate | 4.39% | 4.39% |
Interest rate derivatives |  |  |
Schedule of Debt [Line Items] |  |  |
Derivative, Maturity Date |  | Feb. 15, 2027 |
5.5% Notes, due 2020 |  |  |
Schedule of Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.50% |
Senior Notes and Debentures |  | $ 0 | 500
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 |  | $ 75 | 76
6.625% Notes, due 2042 |  |  |
Schedule of Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.625% |
Senior Notes and Debentures |  | $ 178 | 178
Senior Note Four Point Four Due in Two Thousand Forty Eight [Member] |  |  |
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
4.3% Notes, due 2043 |  |  |
Schedule of Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.30% |
Senior Notes and Debentures |  | $ 300 | 300
7.875% Notes, due 2042 |  |  |
Schedule of Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.875% |
Junior Subordinated Debentures |  | $ 600 | 600
7.875% Notes, due 2042 | Interest Rate Subsequent to Call Date [Member] |  |  |
Schedule of Debt [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 5.596% |
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% |
Junior Subordinated Notes Eight Point One Two Five Percent Due Two Thousand Sixty Eight [Member] |  |  |
Schedule of Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.125% |
Junior Subordinated Debentures |  | $ 0 | $ 0

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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. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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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, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition 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. + References Reference 1: 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)(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: 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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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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 http://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 http://asc.fasb.org/extlink&oid=120398452&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 http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts 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. + 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: 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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: 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(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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