Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Equity, Class of Treasury Stock [Line Items]
Interest expense	$ 181	$ 182	$ 362	$ 360
Income Tax (Expense) Benefit	(717)	(490)	(1,038)	(832)
Net income	2,999	2,216	4,342	4,510
Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Net income	71	7	95	(130)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Income Tax (Expense) Benefit	3	12	28	24
Net income	(65)	17	(98)	(90)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	(68)	5	(126)	(114)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Interest expense	7	3	15	6
Income Tax (Expense) Benefit	(1)	0	(3)	(1)
Net income	6	3	12	5
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Foreign Currency Transaction Gain (Loss), Realized	169	(12)	238	(49)
Interest expense	(5)	(4)	(9)	(8)
Income Tax (Expense) Benefit	(34)	(3)	(48)	12
Net income	$ 130	$ (13)	$ 181	$ (45)