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Share-Based Payments (Details 7) - Performance units
12 Months Ended
Dec. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award  
Beginning Balance, Unvested, Shares 91,000,000
Shares, Granted 10,000,000 [1]
Shares, Vested (52,000,000)
Shares, Forfeited (1,000,000)
Ending Balance, Unvested, Shares 48,000,000
[1] CSPUs issued in 2018 based upon the attainment of performance criteria set for 2017 in relation to CSPUs granted in 2017.