Deferred Acquisition Costs, Deferred Sales Inducements, and Value of Business Acquired Expected Amortization of VOBA (Details) $ in Millions	Dec. 31, 2018 USD ($)
Insurance [Abstract]
Present Value of Future Insurance Profits, Amortization Expense, Year One	$ 73
Present Value of Future Insurance Profits, Amortization Expense, Year Two	77
Present Value of Future Insurance Profits, Amortization Expense, Year Three	72
Present Value of Future Insurance Profits, Amortization Expense, Year Four	68
Present Value of Future Insurance Profits, Amortization Expense, Year Five	$ 68