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Accounting Pronouncements - Leases (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2019 | Jan. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Other current assets | $ 139 | $ 181 |  | $ 146
Operating lease right-of-use assets | 244 | $ 239 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | Other current assets | Other current assets |
Other assets | 1,384 |  |  |
Liabilities [Abstract] |  |  |  |
Other current liabilities | 489 | $ 676 |  | 492
Current operating lease liabilities | $ 53 | $ 58 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other current liabilities | Other current liabilities |  |
Other liabilities | $ 273 | $ 380 |  | 287
Noncurrent operating lease liabilities | $ 182 | $ 181 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities |  |
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |  |
Reclassification of stranded tax effects | $ 79 |  |  |
As Previously reported |  |  |  |
Assets [Abstract] |  |  |  |
Other current assets |  |  |  | 140
Other assets |  |  |  | 1,409
Liabilities [Abstract] |  |  |  |
Other current liabilities |  |  |  | 492
Other liabilities |  |  |  | $ 287
ASU 2016-02 |  |  |  |
Lessee Disclosure [Abstract] |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Fixed List] | Modified Retrospective |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Prior Period Not Restated [true false] | true |  |  |
Practical expedient package adopted | true |  |  |
Land easement practical expedient | true |  |  |
Impact on opening retained earnings balance | $ 0 |  |  |
ASU 2016-02 | Adjustments Due to Adoption |  |  |  |
Assets [Abstract] |  |  |  |
Other current assets | (1) |  |  |
Operating lease right-of-use assets | 244 |  |  |
Other assets | (25) |  |  |
Liabilities [Abstract] |  |  |  |
Other current liabilities | (3) |  |  |
Current operating lease liabilities | 53 |  |  |
Other liabilities | (14) |  |  |
Noncurrent operating lease liabilities | $ 182 |  |  |

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- Definition Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 + Details
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