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Postretirement Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 246	$ 679
Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	40	50
Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	135	185
Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	20	368	$ 384
NAV Practical Expedient
Defined Benefit Plan Disclosure
Fair value of plan assets	51	76
Global stock funds/securities
Defined Benefit Plan Disclosure
Fair value of plan assets	97	128
Global stock funds/securities | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	37	43
Global stock funds/securities | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	51	71
Global stock funds/securities | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Global stock funds/securities | NAV Practical Expedient
Defined Benefit Plan Disclosure
Fair value of plan assets	9	14
Diversified growth and income funds
Defined Benefit Plan Disclosure
Fair value of plan assets	19	28
Diversified growth and income funds | NAV Practical Expedient
Defined Benefit Plan Disclosure
Fair value of plan assets	19	28
Corporate bonds
Defined Benefit Plan Disclosure
Fair value of plan assets	73	100
Corporate bonds | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	1	1
Corporate bonds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	67	92
Corporate bonds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Corporate bonds | NAV Practical Expedient
Defined Benefit Plan Disclosure
Fair value of plan assets	5	7
Government bonds
Defined Benefit Plan Disclosure
Fair value of plan assets	31	44
Government bonds | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Government bonds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	13	17
Government bonds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Government bonds | NAV Practical Expedient
Defined Benefit Plan Disclosure
Fair value of plan assets	18	27
Hedging instruments
Defined Benefit Plan Disclosure
Fair value of plan assets	4	5
Hedging instruments | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Hedging instruments | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	4	5
Hedging instruments | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Insurance contracts and other
Defined Benefit Plan Disclosure
Fair value of plan assets	20	368
Insurance contracts and other | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Insurance contracts and other | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Insurance contracts and other | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	20	368
Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	2	6
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	2	6
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	0	0
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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