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Summary of Significant Accounting Standards and Policies - ASUs (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Recently Adopted Accounting Standards |  |  |  |  |
Lease, Practical expedients, Package | true |  |  |  |
Lease, Practical expedients, Use of hindsight | false |  |  |  |
Operating lease liabilities |  | $ 182 |  |  |
Operating lease assets |  | $ 173 |  | $ 151 |
Operating Lease, Liability, Statement of Financial Position |  | us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent |  | us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent | us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent
ASU 2017-04,Intangibles - Goodwill and Other |  |  |  |  |
Recently Adopted Accounting Standards |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  |  | true |  |
AUS 2016-13, Financial Instruments - Credit Losses |  |  |  |  |
Recently Adopted Accounting Standards |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  |  | true |  |
ASU 2016-02, Leases |  |  |  |  |
Recently Adopted Accounting Standards |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted | true |  |  |  |
ASU 2016-02, Leases | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Recently Adopted Accounting Standards |  |  |  |  |
Operating lease liabilities |  |  |  |  | $ 170
Operating lease assets |  |  |  |  | $ 161
ASU 2018-14 Compensation - Retirement Benefits |  |  |  |  |
Recently Adopted Accounting Standards |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  |  | true |  |
ASU 2017-12 |  |  |  |  |
Recently Adopted Accounting Standards |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted | true |  |  |  |

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