Benefit Plans (Obligations and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Other	$ 21	$ 0
Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	12,243	10,612
Service cost	291	268	$ 214
Interest cost	50	68	118
Benefits paid	(417)	(356)
Employee contributions	145	130
Settlement, curtailment and plan amendment	(194)	(117)
Actuarial losses (gains)	(559)	653
Currency	(587)	992
Other	26	(7)
Benefit obligation, ending balance	10,998	12,243	10,612
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	8,746	7,928
Actual return on plan assets	1,054	206
Employer contributions	269	102
Employee contributions	145	130
Benefits paid	(417)	(356)
Settlement	(37)	(16)
Currency	(444)	752
Fair value of plan assets, ending balance	9,337	8,746	7,928
Net benefit liability	(1,661)	(3,497)
Postretirement
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	198	190
Service cost	2	2	2
Interest cost	5	6	7
Benefits paid	(8)	(7)
Employee contributions	0	0
Settlement, curtailment and plan amendment
Actuarial losses (gains)	5	5
Currency	(4)	3
Other	0	(1)
Benefit obligation, ending balance	198	198	$ 190
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net benefit liability	$ (198)	$ (198)