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Financial Instruments - Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 17, 2017 | Mar. 06, 2017 | Nov. 21, 2016 | Jun. 03, 2016
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Debt Instrument [Line Items] |  |  |  |  |  |  |
Net fair value adjustments related to hedging and purchase accounting |  | $ (5) | $ 14 |  |  |  |
Net unamortized discounts, premiums and debt issuance costs |  | (11) | (12) |  |  |  |
Total long-term debt, carried at historical proceeds, as adjusted | [1] | 32,909 | 33,538 |  |  |  |
Current portion of long-term debt, carried at historical proceeds (not included above (1.3% and 2.4%)) | [1] | $ 4,776 | $ 3,546 |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 1.30% | 2.40% | 4.20% | 0.23% | 3.10% | 2.09%
Total principal amount of long-term debt |  | $ 32,558 | $ 32,783 |  |  |  |
Net fair value adjustments related to hedging and purchase accounting |  | 479 | 872 |  |  |  |
Net unamortized discounts, premiums and debt issuance costs |  | (136) | (125) |  |  |  |
Other long-term debt |  | 7 | 8 |  |  |  |
Total long-term debt, carried at historical proceeds, as adjusted |  | 32,909 | 33,538 |  |  |  |
Current portion of long-term debt, carried at historical proceeds (not included above (1.3% and 2.4%)) |  | $ 4,776 | 3,546 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2019 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage | [2] | 1.30% |  |  |  |  |
Total principal amount of long-term debt | [2] | $ 0 | $ 4,848 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 1.20% | 1.10% |  |  |  |
Total principal amount of long-term debt |  | $ 1,474 | $ 1,528 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 3.40% | 3.50% |  |  |  |
Total principal amount of long-term debt |  | $ 4,459 | $ 3,550 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 0.30% | 0.30% |  |  |  |
Total principal amount of long-term debt |  | $ 1,145 | $ 1,199 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 3.60% | 4.30% |  |  |  |
Total principal amount of long-term debt |  | $ 2,892 | $ 1,592 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 4.40% | 4.40% |  |  |  |
Total principal amount of long-term debt |  | $ 1,500 | $ 1,500 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2026-2028 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 3.30% | 3.20% |  |  |  |
Total principal amount of long-term debt |  | $ 5,718 | $ 4,759 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2034 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 6.50% | 6.50% |  |  |  |
Total principal amount of long-term debt |  | $ 750 | $ 750 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2036-2039 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 6.00% | 6.20% |  |  |  |
Total principal amount of long-term debt |  | $ 7,301 | $ 6,636 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2040-2044 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 3.80% | 3.80% |  |  |  |
Total principal amount of long-term debt |  | $ 4,004 | $ 4,106 |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, Due 2046-2048 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, percentage |  | 4.20% | 4.20% |  |  |  |
Total principal amount of long-term debt |  | $ 3,315 | $ 2,315 |  |  |  |
[1] | Amounts may not add due to rounding.
[2] | At December 31, 2018, the debt issuances have been reclassified to the current portion of long-term debt.

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- Definition Debt Instrument, Fair Value Adjustments, Hedging and Purchase Accounting + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -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(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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + 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)(2) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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=6877327&loc=d3e13212-122682 + Details
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