Reinsurance - Summary of Novation (Details) - Global Atlantic $ in Millions	3 Months Ended
	Sep. 30, 2018 USD ($)
Understatement of policy loans
Schedule of Novated Balances [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 12
Understatement of reinsurance recoverable
Schedule of Novated Balances [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	354
Understatement of interest sensitive contract liabilities
Schedule of Novated Balances [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	292
Understatement of future policy benefits
Schedule of Novated Balances [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 74