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Debt (Unsecured Fixed Rate Debt Securities Issued Under Current Shelf Registration) (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 07, 2020 | Mar. 31, 2020 | Jan. 31, 2020
Unsecured Debt [Member] | 2.150% Notes Due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance date |  | Jan. 31, 2020 |
Note amount |  |  | $ 500,000,000
Interest rate |  |  | 2.15%
Maturity date |  | Feb. 05, 2027 |
Unsecured Debt [Member] | 2.400% Notes Due 2030 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance date |  | Jan. 31, 2020 |
Note amount |  |  | $ 750,000,000
Interest rate |  |  | 2.40%
Maturity date |  | Feb. 05, 2030 |
Unsecured Debt [Member] | 3.250% Notes Due 2050 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance date |  | Jan. 31, 2020 |
Note amount |  |  | $ 1,000,000,000.0
Interest rate |  |  | 3.25%
Maturity date |  | Feb. 05, 2050 |
Unsecured Debt [Member] | 3.750% Notes Due 2070 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance date |  | Jan. 31, 2020 |
Note amount |  |  | $ 750,000,000
Interest rate |  |  | 3.75%
Maturity date |  | Feb. 05, 2070 |
Subsequent Event [Member] | 3.250% Notes Due 2050 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance date | Apr. 07, 2020 |  |
Note amount | $ 750,000,000 |  |
Interest rate | 3.25% |  |
Maturity date | Feb. 05, 2050 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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