Shareholders' Equity Shareholder Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017	Dec. 31, 2019	Jun. 30, 2014
Schedule of Capitalization, Equity [Line Items]
Stock Issued During Period, Shares, Treasury Stock Reissued	33,000,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		0
Junior Subordinated Debt [Member]
Schedule of Capitalization, Equity [Line Items]
Junior Subordinated Notes			$ 1,150
Equity units issued			23,000,000