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Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Lease liabilities | $ 743 |  |  |
Right-of-use asset | $ 684 |  |  |
Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Lease liabilities |  | $ 383 |  |
Right-of-use asset |  | $ 343 |  |
Accounting Standards Update 2014-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of new accounting principle |  |  | $ 208 |
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of new accounting principle |  |  | 208 |
New Accounting Pronouncement, Early Adoption, Effect | Retained Earnings | Accounting Standards Update 2018-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of new accounting principle |  |  | 3 |
New Accounting Pronouncement, Early Adoption, Effect | Retained Earnings | Accounting Standards Update 2017-12 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of new accounting principle |  |  | $ (3) |
New Accounting Pronouncement, Early Adoption, Effect | Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of new accounting principle |  |  |  | $ (3)
New Accounting Pronouncement, Early Adoption, Effect | Accumulated Other Comprehensive Loss | Accounting Standards Update 2017-12 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of new accounting principle |  |  |  | $ 3

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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