Income Taxes Operating Loss Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
U.K.
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 608	$ 41
Capital loss carryforwards	533	573
U.S. Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1	25
Capital loss carryforwards	112	112
Interest Carryforward	2,269	1,140
Foreign tax credit carryforwards	20	18
U.S. State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	473	398
Capital loss carryforwards	123	123
Interest Carryforward	1,187	551
Other
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	490	301
Capital loss carryforwards	8	35
Interest Carryforward	26	26
Other carryforwards	$ 5	$ 5