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Accounting Pronouncements (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease assets (Note 16) | $ 1,610 | $ 1,812
Operating lease liabilities (Note 16) | $ 1,283 | 1,471
Minimum [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Finance lease, renewal term | 12 months |
Operating lease, renewal term | 12 months |
ASU 2016-02 Adopted [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease assets (Note 16) |  | 2,000
Operating lease liabilities (Note 16) |  | $ 2,000
ASU 2016-02 Adopted [Member] | Minimum [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Finance lease, renewal term |  | 12 months
Operating lease, renewal term |  | 12 months

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + 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=121603541&loc=SL77918627-209977 + Details
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