Segment Information (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of segments | Segment	5
Segment Reporting Information [Line Items]
Total assets	$ 666,611	$ 759,708
Total revenues	69,898	71,080	$ 67,842
U.S.
Segment Reporting Information [Line Items]
Total assets	252,559	282,741
One.U.S.Customer | U.S.
Segment Reporting Information [Line Items]
Total revenues	8,100
Japan
Segment Reporting Information [Line Items]
Total assets	$ 127,100	$ 142,700
Assets, Total | Geographic Concentration Risk | Japan
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	19.00%	19.00%
Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration Risk, Benchmark Description		10	10
Revenue Benchmark | Customer Concentration Risk | One.U.S.Customer | U.S.
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	14.00%