Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 60,460	$ 57,768
Net other comprehensive income (loss)	12	(19)
Ending balance	60,305	58,936
Net Unrealized Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	23	22
Other comprehensive income (loss), before reclassifications	0	0
Amounts reclassified from AOCI	0	0
Net other comprehensive income (loss)	0	0
Less other comprehensive (income) loss attributable to noncontrolling interests		0
Ending balance	23	22
Net Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(37)	(39)
Other comprehensive income (loss), before reclassifications	9	(6)
Amounts reclassified from AOCI	3	1
Net other comprehensive income (loss)	12	(5)
Less other comprehensive (income) loss attributable to noncontrolling interests		0
Ending balance	(25)	(44)
Defined Benefit Pension and Other Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(19)	(79)
Other comprehensive income (loss), before reclassifications	0	0
Amounts reclassified from AOCI	0	0
Net other comprehensive income (loss)	0	0
Less other comprehensive (income) loss attributable to noncontrolling interests		0
Ending balance	(19)	(79)
Net Unrealized Gains (Losses) on Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(101)	(64)
Other comprehensive income (loss), before reclassifications	0	(14)
Amounts reclassified from AOCI	0	0
Net other comprehensive income (loss)	0	(14)
Less other comprehensive (income) loss attributable to noncontrolling interests		5
Ending balance	(101)	(73)
Other Comprehensive Income Related to Equity Method Investees
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	8	7
Other comprehensive income (loss), before reclassifications	0	0
Amounts reclassified from AOCI	0	0
Net other comprehensive income (loss)	0	0
Less other comprehensive (income) loss attributable to noncontrolling interests		0
Ending balance	8	7
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(126)	(153)
Other comprehensive income (loss), before reclassifications	9	(20)
Amounts reclassified from AOCI	3	1
Net other comprehensive income (loss)	12	(19)
Less other comprehensive (income) loss attributable to noncontrolling interests		5
Ending balance	$ (114)	(167)
Net unrealized gains (losses) on cash flow hedges. noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		0
Net unrealized gains (losses) on available for sale securities, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		0
Defined benefit pension and other benefits plans, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		0
Net unrealized gains (losses) on foreign currency translation, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		(15)
Other comprehensive income (loss) related to equity method investees, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		0
Total, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		$ (15)