Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 60,883	$ 59,436	$ 60,460	$ 57,768
Net other comprehensive income (loss)	(2)	43	54	18
Ending balance	64,596	59,538	64,596	59,538
Net Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	24	22	23	22
Other comprehensive income (loss), before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	1	1	1
Net other comprehensive income (loss)	0	1	1	1
Less other comprehensive (income) loss attributable to noncontrolling interests		0		0
Ending balance	24	23	24	23
Net Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(15)	(43)	(37)	(39)
Other comprehensive income (loss), before reclassifications	10	32	28	23
Amounts reclassified from AOCI	1	1	5	6
Net other comprehensive income (loss)	11	33	33	29
Less other comprehensive (income) loss attributable to noncontrolling interests		0		0
Ending balance	(4)	(10)	(4)	(10)
Defined Benefit Pension and Other Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(19)	(79)	(19)	(79)
Other comprehensive income (loss), before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	0	0	0
Net other comprehensive income (loss)	0	0	0	0
Less other comprehensive (income) loss attributable to noncontrolling interests		0		0
Ending balance	(19)	(79)	(19)	(79)
Net Unrealized Gains (Losses) on Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(68)	(78)	(101)	(64)
Other comprehensive income (loss), before reclassifications	(13)	8	20	(13)
Amounts reclassified from AOCI	0	0	0	0
Net other comprehensive income (loss)	(13)	8	20	(13)
Less other comprehensive (income) loss attributable to noncontrolling interests		(3)		4
Ending balance	(81)	(73)	(81)	(73)
Other Comprehensive Income (Loss) Related to Equity Method Investees
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	8	7	8	7
Other comprehensive income (loss), before reclassifications	0	1	0	1
Amounts reclassified from AOCI	0	0	0	0
Net other comprehensive income (loss)	0	1	0	1
Less other comprehensive (income) loss attributable to noncontrolling interests		0		0
Ending balance	8	8	8	8
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(70)	(171)	(126)	(153)
Other comprehensive income (loss), before reclassifications	(3)	41	48	11
Amounts reclassified from AOCI	1	2	6	7
Net other comprehensive income (loss)	(2)	43	54	18
Less other comprehensive (income) loss attributable to noncontrolling interests		(3)		4
Ending balance	$ (72)	(131)	$ (72)	(131)
Net unrealized gains (losses) on cash flow hedges. noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		0		0
Net unrealized gains (losses) on available for sale securities, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		0		0
Defined benefit pension and other benefits plans, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		0		0
Net unrealized gains (losses) on foreign currency translation, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		(15)		(15)
Other comprehensive income (loss) related to equity method investees, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		0		0
Total, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		$ (15)		$ (15)