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Share Capital (Tables)
 6 Months Ended
Jun. 30, 2020
Share Capital, Reserves And Other Equity Interest [Abstract]  
Summary of Issued and Fully Paid Ordinary Shares
ISSUED AND FULLY PAID ORDINARY SHARES OF €0.07 EACH1 
 
 
Number of shares
 
Nominal value ($ million)
 
 
A
 
B
 
A
 
B
 
Total
At January 1, 2020
 
4,151,787,517

 
3,729,407,107

 
349

 
308

 
657

Repurchases of shares
 
(50,548,018
)
 
(23,223,271
)
 
(4
)
 
(2
)
 
(6
)
At June 30, 2020
 
4,101,239,499

 
3,706,183,836

 
345

 
306

 
651

At January 1, 2019
 
4,471,889,296

 
3,745,486,731

 
376

 
309

 
685

Repurchases of shares
 
(139,414,447
)
 
—

 
(12
)
 
—

 
(12
)
At June 30, 2019
 
4,332,474,849

 
3,745,486,731

 
365

 
309

 
674

1.    Share capital at June 30, 2020 also included 50,000 issued and fully paid sterling deferred shares of £1 each.