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Debt - Restricted Net Assets (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Senior Notes | 4.98% Senior Notes, due March 2044 |
Debt Instrument |
Amount of net assets restricted from transfer to parent company under different agreements | $ 2,100

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- Definition Amount of net assets restricted from transfer to parent company under different agreements. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |