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Share Plans - Schedule of Movement in Number of Shares held by ESOP Trustees (Details)	12 Months Ended
	Dec. 31, 2018 shares
Deferred shares
Movement in Number of Shares held by ESOP Trustees [Roll Forward]
Beginning balance	15,977,968,688
New shares issued	0
Shares utilized during the year	0
Shares transferred into ESOP during the year	0
Shares sold from the ESOP during the year	0
Ending balance	15,977,968,688
Ordinary shares
Movement in Number of Shares held by ESOP Trustees [Roll Forward]
Beginning balance	104,709
New shares issued	1,863,201
Shares utilized during the year	(149,609)
Shares transferred into ESOP during the year	120,000
Shares sold from the ESOP during the year	(317,000)
Ending balance	1,621,301

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Employee Stock Ownership Plan (ESOP), Shares Sold From ESOP

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Movement In Number Of Shares Held By Employee Stock Ownership Plan Trustees [Roll Forward]

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The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

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-Publisher FASB
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This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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