Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 59,436	$ 53,564	$ 57,768	$ 48,326
Net other comprehensive income (loss)	43	(32)	18	(11)
Ending balance	59,538	56,250	59,538	56,250
Net Unrealized Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	22	21	22	20
Other comprehensive income (loss), before reclassifications	0	0	0	0
Amounts reclassified from AOCI	1	0	1	1
Net other comprehensive income (loss)	1	0	1	1
Less other comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Ending balance	23	21	23	21
Net Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(43)	(63)	(39)	(69)
Other comprehensive income (loss), before reclassifications	32	(19)	23	(20)
Amounts reclassified from AOCI	1	2	6	9
Net other comprehensive income (loss)	33	(17)	29	(11)
Less other comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Ending balance	(10)	(80)	(10)	(80)
Defined Benefit Pension and Other Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(79)	(100)	(79)	(101)
Other comprehensive income (loss), before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	0	0	1
Net other comprehensive income (loss)	0	0	0	1
Less other comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Ending balance	(79)	(100)	(79)	(100)
Net Unrealized Gains (Losses) on Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(78)	(64)	(64)	(74)
Other comprehensive income (loss), before reclassifications	8	(15)	(13)	(2)
Amounts reclassified from AOCI	0	0	0	0
Net other comprehensive income (loss)	8	(15)	(13)	(2)
Less other comprehensive (income) loss attributable to noncontrolling interests	(3)	5	4	2
Ending balance	(73)	(74)	(73)	(74)
Other Comprehensive Income Related to Equity Method Investees
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	7	6	7	6
Other comprehensive income (loss), before reclassifications	1	0	1	0
Amounts reclassified from AOCI	0	0	0	0
Net other comprehensive income (loss)	1	0	1	0
Less other comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Ending balance	8	6	8	6
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(171)	(200)	(153)	(218)
Other comprehensive income (loss), before reclassifications	41	(34)	11	(22)
Amounts reclassified from AOCI	2	2	7	11
Net other comprehensive income (loss)	43	(32)	18	(11)
Less other comprehensive (income) loss attributable to noncontrolling interests	(3)	5	4	2
Ending balance	(131)	(227)	(131)	(227)
Net unrealized gains (losses) on cash flow hedges. noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance	0	0	0	0
Net unrealized gains (losses) on available for sale securities, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance	0	0	0	0
Defined benefit pension and other benefits plans, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance	0	0	0	0
Net unrealized gains (losses) on foreign currency translation, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance	(15)	(15)	(15)	(15)
Other comprehensive income (loss) related to equity method investees, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance	0	0	0	0
Total, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance	$ (15)	$ (15)	$ (15)	$ (15)