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Debt and Derivative Instruments (Short-term Commercial Paper Programs and Line of Credit Facility) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 29, 2021 | Dec. 31, 2020 | Jan. 31, 2021 | Feb. 02, 2020 | Mar. 31, 2020 | Feb. 29, 2020
Short-term Line of Credit and Commercial Paper Programs [Abstract] |  |  |  |  |  |
Balance outstanding at fiscal year-end |  |  | $ 0 | $ 974,000,000 |  |
Commercial Paper |  |  |  |  |  |
Short-term Line of Credit and Commercial Paper Programs [Abstract] |  |  |  |  |  |
Maximum borrowing capacity of credit facility | $ 3,000,000,000.0 |  |  |  | $ 6,000,000,000.0 | $ 3,000,000,000.0
Weighted average interest rate |  |  | 0.00% | 1.56% |  |
Maximum amount outstanding at any month-end |  |  | $ 11,000,000 | $ 2,097,000,000 |  |
Average daily short-term borrowings |  |  | 11,000,000 | $ 624,000,000 |  |
Revolving Credit Facility |  |  |  |  |  |
Short-term Line of Credit and Commercial Paper Programs [Abstract] |  |  |  |  |  |
Maximum borrowing capacity of credit facility |  |  | 6,500,000,000 |  |  |
Revolving Credit Facility | 5-year Back-up Credit Facility |  |  |  |  |  |
Short-term Line of Credit and Commercial Paper Programs [Abstract] |  |  |  |  |  |
Maximum borrowing capacity of credit facility |  | $ 2,000,000,000.0 | $ 2,000,000,000.0 |  |  |
Expiration period |  | 5 years | 5 years |  |  |
Revolving Credit Facility | 364-day Back-up Credit Facility |  |  |  |  |  |
Short-term Line of Credit and Commercial Paper Programs [Abstract] |  |  |  |  |  |
Maximum borrowing capacity of credit facility |  | $ 1,000,000,000.0 | $ 1,000,000,000.0 |  |  |
Expiration period |  | 364 days | 364 days |  |  |
Revolving Credit Facility | March 2020 Back-up Credit Facility |  |  |  |  |  |
Short-term Line of Credit and Commercial Paper Programs [Abstract] |  |  |  |  |  |
Maximum borrowing capacity of credit facility |  |  | $ 3,500,000,000 |  |  |
Expiration period | 364 days |  | 364 days |  |  |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + 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)(2)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 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 Weighted average interest rate of short-term debt outstanding calculated at point in time. + 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References No definition available. + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period. + 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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