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Financial Instruments - Long-Term Debt, New Issuances (Details) - Senior Notes [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |
Principal amount | $ 5,000 | [1]
Weighted average interest rate | 3.56% |
Senior Unsecured Debt, 3.000%, Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, percentage | 3.00% | [2]
Principal amount | $ 1,000 | [2]
Senior Unsecured Debt, LIBOR Plus 0.33% Floating Rate Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 300 | [3]
Senior Unsecured Debt, LIBOR Plus 0.33% Floating Rate Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread | 0.33% | [3]
Senior Unsecured Debt, 3.200%, Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, percentage | 3.20% | [2]
Principal amount | $ 1,000 | [2]
Senior Unsecured Debt, 3.600%, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, percentage | 3.60% | [2]
Principal amount | $ 1,000 | [2]
Senior Unsecured Debt, 4.100%, Due 2038 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, percentage | 4.10% | [2]
Principal amount | $ 700 | [2]
Senior Unsecured Debt, 4.200%, Due 2048 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, percentage | 4.20% | [2]
Principal amount | $ 1,000 | [2]
[1] | The weighted-average effective interest rate for the notes at issuance was 3.56%.
[2] | 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.
[3] | 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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