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Debt (Details Textuals) | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |
Average commercial paper outstanding | $ 628,000,000 | $ 299,000,000 |
Line of credit maintained | $ 3,500,000,000 | 3,500,000,000 |
Ratio of combined earnings and fixed earnings to fixed charges required to maintain availability of credit line | 1.25 |  |
Fees to maintain credit lines | $ 14,200,000 | 16,500,000 |
Total interest paid | 2,000,000,000.0 | 3,400,000,000 | $ 2,700,000,000
Short-term Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fees to maintain the secured financing facility | $ 7,700,000 | 7,700,000 |
Charge Trust [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Specified date face amount of eligible notes issued | Jul. 15, 2022 |  |
Face amount of eligible notes from Charge Trust | $ 3,000,000,000.0 |  |
Lending Trust [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt term | 3 years |  |
Face amount of eligible notes issued | $ 2,000,000,000.0 |  |
Specified date face amount of eligible notes issued | Sep. 15, 2022 |  |
Subsidiaries [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit maintained | $ 148,000,000 | 214,000,000 |
Amount drawn from committed lines | $ 0 | $ 58,000,000 |

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- Definition Debt Instrument, Restrictive Covenants, Combined Earnings, Certain Capital Contributions, And Fixed Charges, To Fixed Charges + References No definition available. + Details
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- Definition Represents the fees paid to maintain the Company's short-term secured financing facilities. + References No definition available. + Details
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- Definition Represents the face amount of eligible notes, which are secured through a financing facility, and can be issued through a specified date. + References No definition available. + Details
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- Definition Represents the face amount of eligible note that the Company has the right to sell up to at any time through July 15, 2016. + References No definition available. + Details
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- Definition Represents the specified date in which the face amount of eligible notes, which are secured through a financing facility, can be issued. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 + Details
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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current portion 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 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(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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