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Basis of Presentation - Summary of Significant Accounting Policies, Accounting Changes (Details) $ in Billions | Jan. 01, 2021 USD ($)
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Accounting Standards Update 2018-12 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Decrease in AOCI | $ 2.1

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- Definition Amount of increase (decrease) in accumulated other comprehensive income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 + Details
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