Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning	$ (218)	$ 0	$ (92)
Other comprehensive income (loss), before reclassifications	52	(260)	84
Amounts reclassified from AOCI	16	23	7
Total other comprehensive income (loss), net of tax	68	(237)	91
Less other comprehensive (income) loss attributable to noncontrolling interests	(3)	19	1
Accumulated other comprehensive income (loss), ending	(153)	(218)	0
AOCI Including Portion Attributable to Noncontrolling Interest, Net Of Tax	(10)
Net Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning	20	14	8
Other comprehensive income (loss), before reclassifications	0	0	0
Amounts reclassified from AOCI	2	6	6
Total other comprehensive income (loss), net of tax	2	6	6
Less other comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Accumulated other comprehensive income (loss), ending	22	20	14
AOCI Including Portion Attributable to Noncontrolling Interest, Net Of Tax	0
Net Unrealized Gains (Losses) on Available for Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning	(69)	5	20
Other comprehensive income (loss), before reclassifications	17	(84)	(11)
Amounts reclassified from AOCI	13	10	(4)
Total other comprehensive income (loss), net of tax	30	(74)	(15)
Less other comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Accumulated other comprehensive income (loss), ending	(39)	(69)	5
AOCI Including Portion Attributable to Noncontrolling Interest, Net Of Tax	0
Defined Benefit Pension and Other Benefits Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning	(101)	25	(75)
Other comprehensive income (loss), before reclassifications	21	(133)	95
Amounts reclassified from AOCI	1	7	5
Total other comprehensive income (loss), net of tax	22	(126)	100
Less other comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Accumulated other comprehensive income (loss), ending	(79)	(101)	25
AOCI Including Portion Attributable to Noncontrolling Interest, Net Of Tax	0
Net Unrealized Gains (Losses) on Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning	(74)	(49)	(49)
Other comprehensive income (loss), before reclassifications	13	(44)	(1)
Amounts reclassified from AOCI	0	0	0
Total other comprehensive income (loss), net of tax	13	(44)	(1)
Less other comprehensive (income) loss attributable to noncontrolling interests	(3)	19	1
Accumulated other comprehensive income (loss), ending	(64)	(74)	(49)
AOCI Including Portion Attributable to Noncontrolling Interest, Net Of Tax	(10)
Other Comprehensive Income Related to Equity Method Investees
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning	6	5	4
Other comprehensive income (loss), before reclassifications	1	1	1
Amounts reclassified from AOCI	0	0	0
Total other comprehensive income (loss), net of tax	1	1	1
Less other comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Accumulated other comprehensive income (loss), ending	7	$ 6	$ 5
AOCI Including Portion Attributable to Noncontrolling Interest, Net Of Tax	$ 0