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Hedging Activities - Summary of Derivative Instruments Gain (Loss) (Details) - Derivatives designated for hedge accounting - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Derivatives designated as net investment hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as net investment hedges: | $ 12 | $ (5)
Fixed interest rate swaps | Derivatives designated as cash flow hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as cash flow hedges: | 27 | 2
Derivatives designated as net investment hedges: | Derivatives designated as cash flow hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as cash flow hedges: | $ (2) | $ (2)

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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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- Definition Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CCC -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998896-113959 + Details
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