Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 44,554	$ 45,114	$ 45,424	$ 44,929
Net other comprehensive income (loss)	(78)	(14)	(140)	(2)
Ending balance	46,746	44,647	46,746	44,647
Net Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	19	12	14	8
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	0	5	4
Net other comprehensive income (loss)	0	0	5	4
Less other comprehensive loss attributable to noncontrolling interests	0	0	0
Ending balance	19	12	19	12
Net Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(53)	11	5	20
Other comprehensive income (loss) before reclassifications	(31)	(2)	(91)	(9)
Amounts reclassified from AOCI	1	(1)	3	(3)
Net other comprehensive income (loss)	(30)	(3)	(88)	(12)
Less other comprehensive loss attributable to noncontrolling interests	0	0	0
Ending balance	(83)	8	(83)	8
Defined Benefit Pension and Other Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	25	(73)	25	(75)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI	0	1	0	3
Net other comprehensive income (loss)	0	1	0	3
Less other comprehensive loss attributable to noncontrolling interests	0	0	0
Ending balance	25	(72)	25	(72)
Net Unrealized Gains (Losses) on Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(55)	(39)	(49)	(49)
Other comprehensive income (loss) before reclassifications	(49)	(13)	(58)	2
Amounts reclassified from AOCI	0	0	0	0
Net other comprehensive income (loss)	(49)	(13)	(58)	2
Less other comprehensive loss attributable to noncontrolling interests	23	5	26
Ending balance	(81)	(47)	(81)	(47)
Other Comprehensive Income Related to Equity Method Investees
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	5	4	5	4
Other comprehensive income (loss) before reclassifications	1	1	1	1
Amounts reclassified from AOCI	0	0	0	0
Net other comprehensive income (loss)	1	1	1	1
Less other comprehensive loss attributable to noncontrolling interests	0	0	0
Ending balance	6	5	6	5
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(59)	(85)	0	(92)
Other comprehensive income (loss) before reclassifications	(79)	(14)	(148)	(6)
Amounts reclassified from AOCI	1	0	8	4
Net other comprehensive income (loss)	(78)	(14)	(140)	(2)
Less other comprehensive loss attributable to noncontrolling interests	23	5	26
Ending balance	(114)	(94)	(114)	(94)
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	(21)	(8)	(21)	(8)
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	$ (21)	$ (8)	$ (21)	$ (8)