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Employee Benefit Plans (Pension Plans) (Level 3 Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance, Plan Assets | $ 63,323 |
Ending Balance, Plan Assets | 47,960 | $ 63,323
Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance, Plan Assets | 1,885 | 1,649
Realized gains | 76 | 212
Unrealized gains (losses) relating to instruments still held in the reporting period | 64 | 50
Purchases, sales and settlements, net | (211) | (24)
Transfers in/out, net | (164) | (2)
Ending Balance, Plan Assets | 1,650 | 1,885
Corporate Bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance, Plan Assets | 18,682 |
Ending Balance, Plan Assets | 12,639 | 18,682
Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance, Plan Assets | 0 | 2
Realized gains | 0 | 0
Unrealized gains (losses) relating to instruments still held in the reporting period | 0 | 0
Purchases, sales and settlements, net | 0 | 0
Transfers in/out, net | 0 | (2)
Ending Balance, Plan Assets | 0 | 0
Real Estate [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance, Plan Assets | 3,628 |
Ending Balance, Plan Assets | 3,411 | 3,628
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance, Plan Assets | 1,885 | 1,647
Realized gains | 76 | 212
Unrealized gains (losses) relating to instruments still held in the reporting period | 64 | 50
Purchases, sales and settlements, net | (211) | (24)
Transfers in/out, net | (164) | 0
Ending Balance, Plan Assets | $ 1,650 | $ 1,885

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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