Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 570	$ 492	$ 516
Income tax expense	1,255	1,277	629
Net income	5,313	8,539	3,533
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(797)	9	(245)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment	(1,049)	3	(281)
Income tax expense	170	6	36
Net income	(879)	9	(245)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cumulative Translation Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	4	0	0
Income tax expense	(1)	0	0
Net income	3	0	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(5)	0	0
Income tax expense	(21)	0	0
Net income	79	0	0
Foreign Currency Transaction Gain (Loss), Realized	$ 105	$ 0	$ 0