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Short-Term and Long-Term Debt (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Long-term debt | $ 19,730,000,000 | $ 19,718,000,000
Debt, Current | $ 867,000,000 | 925,000,000
Document Period End Date | Mar. 31, 2021 |
Amounts drawn on credit facilities | $ 0 |
Assets Under Set-Off Arrangements |  |
Debt Instrument [Line Items] |  |
Long-term debt | 10,264,000,000 | 10,464,000,000
Debt, Current | 250,000,000 | 500,000,000
Junior Subordinated Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt | 7,613,000,000 | 7,615,000,000
Parent Company |  |
Debt Instrument [Line Items] |  |
Long-term debt | 18,565,000,000 | 18,561,000,000
Debt, Current | 425,000,000 | 424,000,000
Parent Company | Junior Subordinated Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt | 7,556,000,000 | 7,554,000,000
Subsidiaries | Junior Subordinated Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt | 57,000,000 | 60,000,000
Long-term debt |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Current Maturities | 712,000,000 | 1,027,000,000
Long-term debt | Senior notes |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Current Maturities | 400,000,000 | 399,000,000
Fed Funds Effective Rate Overnight Index Swap Rate | Senior notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | 11,182,000,000 | 11,179,000,000
Fed Funds Effective Rate Overnight Index Swap Rate | Mortgages |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 24,000,000 | $ 24,000,000

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD. + 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 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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