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Debt (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 23, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Disclosure [Abstract] |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 | $ (168,000,000) | $ 0
Long-term debt |  |  |  | 9,127,000,000 | 9,132,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt and Lease Obligation, Including Current Maturities |  |  |  | 9,138,000,000 | 9,827,000,000 |
Short-term borrowings and current maturities of long-term debt |  |  |  | 11,000,000 | 695,000,000 |
Debt Instrument, Unamortized Discount |  |  |  | $ (77,000,000) | (82,000,000) |
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 |  |  |  | 7,000,000 | 695,000,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  | 600,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  |  | 0 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  |  | 1,000,000,000 |  |
Long-term Debt, Maturities Repayments of Principal in Year Five |  |  |  | 0 |  |
Long-term debt |  |  |  | 9,127,000,000 | 9,132,000,000 |
Gain (Loss) on Extinguishment of Debt |  |  |  | 0 | (168,000,000) | $ 0
Long-Term Debt, Maturity, Year One |  |  |  | 7,000,000 |  |
Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subsequent Event, Date | Feb. 23, 2022 |  |  |  |  |
Senior notes due November 2045 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 2,000,000,000 | $ 2,000,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 5.00% | 5.00% |
Maturity date |  |  |  | November 2045 | November 2045 |
Long-term debt |  |  |  | $ 2,000,000,000 | $ 2,000,000,000 |
Senior Notes due November 2025 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 3.80% | 3.80% |
Maturity date |  |  |  | November 2025 | November 2025 |
Long-term debt |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Senior Notes due November 2025 | Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Early Repayment of Senior Debt | $ 600,000,000 |  |  |  |  |
Senior notes due August 2023 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 600,000,000 | $ 600,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 3.50% | 3.50% |
Maturity date |  |  |  | August 2023 | August 2023 |
Long-term debt |  |  |  | $ 600,000,000 | $ 600,000,000 |
Senior Notes due November 2035 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 4.85% | 4.85% |
Maturity date |  |  |  | November 2035 | November 2035 |
Long-term debt |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Senior notes due September 2039 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 7.45% | 7.45% |
Maturity date |  |  |  | September 2039 | September 2039 |
Long-term debt |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Senior notes due August 2043 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 900,000,000 | $ 900,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 4.75% | 4.75% |
Maturity date |  |  |  | August 2043 | August 2043 |
Long-term debt |  |  |  | $ 900,000,000 | $ 900,000,000 |
Senior notes due September 2038 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 800,000,000 | $ 800,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 6.70% | 6.70% |
Maturity date |  |  |  | September 2038 | September 2038 |
Long-term debt |  |  |  | $ 800,000,000 | $ 800,000,000 |
Senior notes due November 2021 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 | $ 500,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 3.25% | 3.25% |
Maturity date |  |  |  | November 2021 | November 2021 |
Long-term debt |  |  |  | $ 0 | $ 500,000,000 |
Repayments of Senior Debt |  | $ 500,000,000 |  |  |  |
Senior notes due November 2041 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 500,000,000 | $ 500,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 4.50% | 4.50% |
Maturity date |  |  |  | November 2041 | November 2041 |
Long-term debt |  |  |  | $ 500,000,000 | $ 500,000,000 |
Senior debentures due August 2096 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 300,000,000 | $ 300,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
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 |
Long-term debt |  |  |  | $ 300,000,000 | $ 300,000,000 |
Senior debentures due February 2021 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 | $ 185,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
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 |
Long-term debt |  |  |  | $ 0 | $ 185,000,000 |
Repayments of Senior Debt |  |  | $ 185,000,000 |  |  |
Senior notes due February 2027 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 104,000,000 | $ 104,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
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 |
Long-term debt |  |  |  | $ 104,000,000 | $ 104,000,000 |
Other Debt Obligations |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | 11,000,000 | 20,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  | 11,000,000 | 20,000,000 |
Senior notes due March 2030 |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | $ 1,000,000,000 | 1,000,000,000 |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 2.92% |  |
Long-term debt |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Tender Offer on Senior notes due August 2023 and November 2025 [Member] |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | 1,500,000,000 |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  | 1,500,000,000 |  |
Tender Offer on Senior note due August 2023 [Member] |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | 500,000,000 |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  | 500,000,000 |  |
Tender Offer on Senior note due November 2025 [Member] |  |  |  |  |  |
Debt Disclosure [Abstract] |  |  |  |  |  |
Long-term debt |  |  |  | 1,000,000,000 |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  | $ 1,000,000,000 |  |
Senior notes due August 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  | 3.25% |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + References No definition available. + Details
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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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=120391452&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=123599511&loc=d3e64711-112823 + Details
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