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Summary of Significant Accounting Policies - Recently Adopted and Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Excess tax benefits from share-based compensation awards | $ 34 | $ 48 |
Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of new accounting principle |  | 208 |
Accounting Standards Update 2014-09 | Retained Earnings |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of new accounting principle |  | 208 |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Loss |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of new accounting principle |  | (3) |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Retained Earnings |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of new accounting principle | 3 | 3 |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Accumulated Other Comprehensive Loss |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of new accounting principle |  | 3 |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Retained Earnings |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of new accounting principle | $ (3) | $ (3) |
Forecast | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-11 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Lease liabilities |  |  | $ 375
Right-of-use asset |  |  | $ 350

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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/presentationRef -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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