Retirement Benefits (Schedule of Benefit Obligations and Plan Assets and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Pension Plans
Change in benefit obligation:
Benefit obligation at beginning of year	$ 18,225.5	$ 16,251.0
Service cost	369.2	325.5	$ 250.4
Interest cost	337.8	425.8	486.0
Actuarial (gain) loss	(564.3)	1,563.1
Benefits paid	(630.1)	(587.2)
Curtailment loss	0.0	2.2
Foreign currency exchange rate changes and other adjustments	(173.1)	245.1
Benefit obligation at end of year	17,565.0	18,225.5	16,251.0
Change in plan assets:
Fair value of plan assets at beginning of year	14,579.0	12,858.0
Actual return on plan assets	2,458.1	1,802.4
Employer contribution	131.2	318.8
Benefits paid	(630.1)	(587.2)
Foreign currency exchange rate changes and other adjustments	(122.2)	187.0
Fair value of plan assets at end of year	16,416.0	14,579.0	12,858.0
Funded status	(1,149.0)	(3,646.5)
Unrecognized net actuarial (gain) loss	3,908.2	6,515.5
Unrecognized prior service (benefit) cost	11.2	15.4
Net amount recognized	2,770.4	2,884.4
Retiree Health Benefit Plans
Change in benefit obligation:
Benefit obligation at beginning of year	1,753.7	1,601.4
Service cost	49.2	40.8	36.3
Interest cost	32.5	43.7	58.0
Actuarial (gain) loss	(86.1)	142.1
Benefits paid	(79.3)	(75.1)
Curtailment loss	0.0	0.0
Foreign currency exchange rate changes and other adjustments	(6.2)	0.8
Benefit obligation at end of year	1,663.8	1,753.7	1,601.4
Change in plan assets:
Fair value of plan assets at beginning of year	3,227.0	2,768.2
Actual return on plan assets	202.6	539.0
Employer contribution	11.1	(5.1)
Benefits paid	(79.3)	(75.1)
Foreign currency exchange rate changes and other adjustments	0.0	0.0
Fair value of plan assets at end of year	3,361.4	3,227.0	$ 2,768.2
Funded status	1,697.6	1,473.3
Unrecognized net actuarial (gain) loss	(497.2)	(349.1)
Unrecognized prior service (benefit) cost	(117.6)	(177.6)
Net amount recognized	$ 1,082.8	$ 946.6

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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