Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis and Related Impairment Charges (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	[1]	$ 15,977		$ 16,217
Impairment Charges		26	$ 11
Fair value on a non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments		98		80
Other assets		0
Total		98		80
Impairment Charges		26	9
Fair value on a non-recurring basis | Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment Charges		25	0
Fair value on a non-recurring basis | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment Charges		1	$ 9
Fair value on a non-recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments		0		0
Other assets		0
Total		0		0
Fair value on a non-recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments		0		0
Other assets		0
Total		0		0
Fair value on a non-recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments		98		80
Other assets		0
Total		$ 98		$ 80

[1] See Note 10 for details of balances associated with variable interest entities.