Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 48,326	$ 45,424
Net other comprehensive income (loss)	19	(14)
Ending balance	52,123	44,049
Net Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	20	14
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	1	4
Net other comprehensive income (loss)	1	4
Less other comprehensive income attributable to noncontrolling interests	0	0
Ending balance	21	18
Net Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(69)	5
Other comprehensive income (loss) before reclassifications	9	(30)
Amounts reclassified from AOCI	5	0
Net other comprehensive income (loss)	14	(30)
Less other comprehensive income attributable to noncontrolling interests	0	0
Ending balance	(55)	(25)
Defined Benefit Pension and Other Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(101)	25
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	1	0
Net other comprehensive income (loss)	1	0
Less other comprehensive income attributable to noncontrolling interests	0	0
Ending balance	(100)	25
Net Unrealized Gains (Losses) on Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(74)	(49)
Other comprehensive income (loss) before reclassifications	3	12
Amounts reclassified from AOCI	0	0
Net other comprehensive income (loss)	3	12
Less other comprehensive income attributable to noncontrolling interests	(1)	(6)
Ending balance	(72)	(43)
Other Comprehensive Income Related to Equity Method Investees
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	6	5
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 attributable to noncontrolling interests	0	0
Ending balance	6	5
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(218)	0
Other comprehensive income (loss) before reclassifications	12	(18)
Amounts reclassified from AOCI	7	4
Net other comprehensive income (loss)	19	(14)
Less other comprehensive income attributable to noncontrolling interests	(1)	(6)
Ending balance	(200)	(20)
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	(13)	12
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	$ (13)	$ 12