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Shareholders' Equity - Restricted Stock Units (Details) - Restricted Stock Units (RSUs)
shares in Millions
3 Months Ended
Mar. 31, 2018
shares
Key Employee Equity Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units granted in period (in shares) 71
Key Employee Equity Plan, 3-year Vesting  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units granted in period (in shares) 63
Number of vesting installments 3 years
Key Employee Equity Plan, 3-year Vesting | Year 1  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting percentage 33.33%
Key Employee Equity Plan, 3-year Vesting | Year 2  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting percentage 33.33%
Key Employee Equity Plan, 3-year Vesting | Year 3  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting percentage 33.33%
Key Employee Equity Plan, 4-year Vesting  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units granted in period (in shares) 8
Number of vesting installments 4 years
Key Employee Equity Plan, 4-year Vesting | Year 1  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting percentage 25.00%
Key Employee Equity Plan, 4-year Vesting | Year 2  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting percentage 25.00%
Key Employee Equity Plan, 4-year Vesting | Year 3  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting percentage 25.00%
Key Employee Equity Plan, 4-year Vesting | Year 4  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting percentage 25.00%