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Debt - Restricted Net Assets (Details) $ in Millions | Sep. 30, 2017 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 | $ 1,500

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Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |

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- Details
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Data Type: | na
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Period Type: |