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Debt (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Long-term Debt and Lease Obligation, Including Current Maturities | $ 10,327,000,000 | $ 10,344,000,000
Short-term borrowings and current maturities of long-term debt | 11,000,000 | 32,000,000
Long-term debt | 10,316,000,000 | 10,312,000,000
Debt Instrument, Unamortized Discount | $ (90,000,000) | (92,000,000)
Debt instrument call feature description | We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest. |
Long-term Line of Credit | $ 3,500,000,000 |
Line of Credit Facility, Remaining Borrowing Capacity | 3,500,000,000 |
Long-term Debt, Current Maturities | 11,000,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 697,000,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 4,000,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 1,100,000,000 |
Long-term Debt, Maturities Repayments of Principal in Year Five | 0 |
Senior notes due November 2045 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,000,000,000 | $ 2,000,000,000
Interest rate (in hundredths) | 5.00% | 5.00%
Maturity date | November 2045 | November 2045
Senior Notes due November 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,000,000,000 | $ 2,000,000,000
Interest rate (in hundredths) | 3.80% | 3.80%
Maturity date | November 2025 | November 2025
Senior notes due August 2023 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,100,000,000 | $ 1,100,000,000
Interest rate (in hundredths) | 3.50% | 3.50%
Maturity date | August 2023 | August 2023
Senior Notes due November 2035 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,000,000,000 | $ 1,000,000,000
Interest rate (in hundredths) | 4.85% | 4.85%
Maturity date | November 2035 | November 2035
Senior notes due September 2039 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,000,000,000 | $ 1,000,000,000
Interest rate (in hundredths) | 7.45% | 7.45%
Maturity date | September 2039 | September 2039
Senior notes due August 2043 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 900,000,000 | $ 900,000,000
Interest rate (in hundredths) | 4.75% | 4.75%
Maturity date | August 2043 | August 2043
Senior notes due September 2038 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 800,000,000 | $ 800,000,000
Interest rate (in hundredths) | 6.70% | 6.70%
Maturity date | September 2038 | September 2038
Senior notes due November 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 500,000,000 | $ 500,000,000
Interest rate (in hundredths) | 3.25% | 3.25%
Maturity date | November 2021 | November 2021
Senior notes due November 2041 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 500,000,000 | $ 500,000,000
Interest rate (in hundredths) | 4.50% | 4.50%
Maturity date | November 2041 | November 2041
Senior debentures due August 2096 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 300,000,000 | $ 300,000,000
Interest rate (in hundredths) | 7.60% | 7.60%
Debt instruments non-call feature description | may not be redeemed prior to maturity |
Maturity date | August 2096 | August 2096
Senior debentures due February 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 185,000,000 | $ 185,000,000
Interest rate (in hundredths) | 8.75% | 8.75%
Debt instruments non-call feature description | may not be redeemed prior to maturity |
Maturity date | February 2021 | February 2021
Senior notes due February 2027 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 104,000,000 | $ 104,000,000
Interest rate (in hundredths) | 6.75% | 6.75%
Debt instruments non-call feature description | may not be redeemed prior to maturity |
Maturity date | February 2027 | February 2027
Other Debt Obligations |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 28,000,000 | $ 47,000,000

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- Definition Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt. + 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)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + 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=6877327&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=6876686&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=119400593&loc=d3e572229-122910 + Details
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