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Long-Term Debt and Available Credit Facilities Debt Redemptions/Repayments (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended | 37 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 02, 2019 | Dec. 11, 2018 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | [1] | Dec. 31, 2018 | [1] | Nov. 13, 2021 | Mar. 31, 2019 | Mar. 31, 2020 | May 17, 2019 | Mar. 22, 2019 | Nov. 13, 2018 | Jul. 01, 2018 | Mar. 22, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 1,530 |  |  |
Repayments of Long-term Debt, including breakage fees and all applicable accrued and unpaid interest | $ 4,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on Extinguishment of Debt |  |  | $ (13) | $ 0 | $ (13) | $ (81) |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500
Senior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Transition Bond |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |
4.625% Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 474 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 4.625% |  |  |
3.625% Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 296 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 3.625% |  |  |
4.250% Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 163 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 4.25% |  |  |
2.800% Notes due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 381 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 2.80% |  |  |
6.500% Debentures due 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 57 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |
5.600% Senior Notes due 2036 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 42 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 5.60% |  |  |
4.900% Notes due 2041 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 48 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 4.90% |  |  |
4.150% Notes due 2043 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 69 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 4.15% |  |  |
Senior Note 2.20 Percent Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 2.20% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 1,250 |  |  |  |
Senior Note Floating Rate Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | 750 |  |  |  |
SMR notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |
Tender Notes [Member] | Loans Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tender Offer for Debt Securities |  |  |  |  |  |  |  |  |  |  |  | $ 6,200 |  |
Extinguishment of Debt, Amount |  | $ 4,409 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt, including breakage fees and all applicable accrued and unpaid interest |  | 4,849 |  |  |  |  |  |  |  |  |  |  |  |
Loss on Extinguishment of Debt |  | $ 81 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facilities due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 3,000 |  |  |  |  |  |  |  | $ 3,000 |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |
EID [Member] | Term Loan Facility due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500
[1] | The cash flows for the years ended December 31, 2018 and 2019 includes cash flows of EID's ECP and Specialty Products Entities.

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