Benefit Plans (Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in benefit obligation:
Actuarial (gain) loss	$ (84)	$ 205
Pension Benefits
Changes in benefit obligation:
Balance at beginning of period	2,769	2,661
Interest cost	62	80	$ 100
Participants' contributions	0	0
Actuarial (gain) loss	(84)	205
Benefits paid	(182)	(173)
Foreign currency translation and other	(2)	3
Settlements	(2)	(7)
Balance at end of period	2,561	2,769	2,661
Change in plan assets:
Balance beginning of period	2,420	2,285
Actual return on plan assets	332	295
Company contributions	10	16
Participants' contributions	0	0
Benefits paid	(182)	(173)
Foreign currency translation and other	(1)	4
Settlements	(2)	(7)
Balance end of period	2,577	2,420	2,285
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	16	(349)
Amounts recognized on the Consolidated Balance Sheets as of December 31:
Other assets	77	2
Other liabilities	(61)	(351)
Net amount recognized	16	(349)
Amounts recognized in Accumulated other comprehensive income, not yet recognized in net periodic cost (benefit):
Net actuarial (gain) loss	763	1,073
Net amount recognized	763	1,073
Postretirement Benefits
Changes in benefit obligation:
Balance at beginning of period	7	8
Interest cost	0	0
Participants' contributions	3	2
Actuarial (gain) loss	1	2
Benefits paid	(5)	(5)
Foreign currency translation and other	0	0
Settlements	0	0
Balance at end of period	6	7	8
Change in plan assets:
Balance beginning of period	0	0
Actual return on plan assets	0	0
Company contributions	2	3
Participants' contributions	3	2
Benefits paid	(5)	(5)
Foreign currency translation and other	0	0
Settlements	0	0
Balance end of period	0	0	$ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	(6)	(7)
Amounts recognized on the Consolidated Balance Sheets as of December 31:
Other assets	0	0
Other liabilities	(6)	(7)
Net amount recognized	(6)	(7)
Amounts recognized in Accumulated other comprehensive income, not yet recognized in net periodic cost (benefit):
Net actuarial (gain) loss	1	0
Net amount recognized	$ 1	$ 0