Benefit Plans (Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in benefit obligation:
Actuarial (gain) loss	$ 27	$ (514)
Pension Benefits
Changes in benefit obligation:
Balance at beginning of period	1,931	2,561
Interest cost	98	67	$ 62
Participants' contributions	0	0
Actuarial (gain) loss	27	(514)
Benefits paid	(168)	(171)
Foreign currency translation and other	5	(12)
Settlement through group annuity purchase	(86)	0
Balance at end of period	1,807	1,931	2,561
Change in plan assets:
Balance beginning of period	2,025	2,577
Actual return on plan assets	194	(374)
Company contributions	8	7
Participants' contributions	0	0
Benefits paid	(168)	(171)
Foreign currency translation and other	5	(14)
Settlement through group annuity purchase	(80)	0
Balance end of period	1,984	2,025	2,577
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	177	94
Amounts recognized on the Consolidated Balance Sheets as of December 31:
Other assets	223	143
Other liabilities	(46)	(49)
Net amount recognized	177	94
Amounts recognized in Accumulated other comprehensive income, not yet recognized in net periodic cost (benefit):
Net actuarial (gain) loss	658	743
Net amount recognized	658	743
Postretirement Benefits
Changes in benefit obligation:
Balance at beginning of period	4	6
Interest cost	0	0
Participants' contributions	1	2
Actuarial (gain) loss	4	0
Benefits paid	(4)	(4)
Foreign currency translation and other	0	0
Settlement through group annuity purchase	0	0
Balance at end of period	5	4	6
Change in plan assets:
Balance beginning of period	0	0
Actual return on plan assets	0	0
Company contributions	3	2
Participants' contributions	1	2
Benefits paid	(4)	(4)
Foreign currency translation and other	0	0
Settlement through group annuity purchase	0	0
Balance end of period	0	0	$ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	(5)	(4)
Amounts recognized on the Consolidated Balance Sheets as of December 31:
Other assets	0	0
Other liabilities	(5)	(4)
Net amount recognized	(5)	(4)
Amounts recognized in Accumulated other comprehensive income, not yet recognized in net periodic cost (benefit):
Net actuarial (gain) loss	3	1
Net amount recognized	$ 3	$ 1