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Financial Instruments - Long-Term Debt - New Issuances (Details) - Senior Notes [Member] $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Debt Instrument [Line Items] |  |
Principal | $ 5,000 |
3.000% notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal | $ 1,000 | [1]
Stated interest rate | 3.00% | [2]
Floating rate notes (LIBOR plus 0.33%) [Member] |  |
Debt Instrument [Line Items] |  |
Principal | $ 300 | [2]
Floating rate notes (LIBOR plus 0.33%) [Member] | LIBOR [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.33% | [1]
3.200% notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal | $ 1,000 | [1]
Stated interest rate | 3.20% | [2]
3.600% notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal | $ 1,000 | [1]
Stated interest rate | 3.60% | [2]
4.100% notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal | $ 700 | [1]
Stated interest rate | 4.10% | [2]
4.200% notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal | $ 1,000 | [1]
Stated interest rate | 4.20% | [2]
[1] | Fixed rate notes may be redeemed by us at any time, in whole, or in part, at varying redemption prices plus accrued and unpaid interest.
[2] | Floating rate notes may not be redeemed by their terms prior to maturity.

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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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 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=6879938&loc=d3e572229-122910 Reference 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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