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Employee Benefit Plans (Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | $ 10,971 | $ 11,256
Purchases, sales, issuances and settlements, net | (38) | (35)
Estimated fair value of plan assets at December 31, | 8,294 | 10,971
Pension Benefits | Foreign government |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 1,116 |
Estimated fair value of plan assets at December 31, | 769 | 1,116
Pension Benefits | Other (1) |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 783 |
Estimated fair value of plan assets at December 31, | 693 | 783
Pension Benefits | Equity Securities |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 895 |
Estimated fair value of plan assets at December 31, | 570 | 895
Pension Benefits | Corporate fixed maturity securities |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 4,305 |
Estimated fair value of plan assets at December 31, | 3,001 | 4,305
Other Postretirement Benefits |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 1,443 | 1,492
Purchases, sales, issuances and settlements, net | 0 | (1)
Estimated fair value of plan assets at December 31, | 1,303 | 1,443
Other Postretirement Benefits | Foreign government |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 51 |
Estimated fair value of plan assets at December 31, | 61 | 51
Other Postretirement Benefits | Other (1) |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 59 |
Estimated fair value of plan assets at December 31, | 44 | 59
Other Postretirement Benefits | Equity Securities |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 55 |
Estimated fair value of plan assets at December 31, | 47 | 55
Other Postretirement Benefits | Corporate fixed maturity securities |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 222 |
Estimated fair value of plan assets at December 31, | 205 | 222
Level 3 | Pension Benefits |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 967 |
Estimated fair value of plan assets at December 31, | 920 | 967
Level 3 | Pension Benefits | Foreign government |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 1 | 0
Realized gains (losses) | 0 | 0
Unrealized gains (losses) | 0 | 0
Purchases, sales, issuances and settlements, net | 0 | 1
Transfers into and/or out of Level 3 | (1) | 0
Estimated fair value of plan assets at December 31, | 0 | 1
Level 3 | Pension Benefits | Other (1) |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 1 | 0
Realized gains (losses) | 0 | 0
Unrealized gains (losses) | 0 | 0
Purchases, sales, issuances and settlements, net | 3 | 1
Transfers into and/or out of Level 3 | (1) | 0
Estimated fair value of plan assets at December 31, | 3 | 1
Level 3 | Pension Benefits | Equity Securities |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 11 | 0
Realized gains (losses) | 0 | 0
Unrealized gains (losses) | 0 | 0
Purchases, sales, issuances and settlements, net | (8) | 11
Transfers into and/or out of Level 3 | 0 | 0
Estimated fair value of plan assets at December 31, | 3 | 11
Level 3 | Pension Benefits | Other investments |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 954 | 708
Realized gains (losses) | 0 | 0
Unrealized gains (losses) | 54 | 63
Purchases, sales, issuances and settlements, net | (153) | 183
Transfers into and/or out of Level 3 | 0 | 0
Estimated fair value of plan assets at December 31, | 855 | 954
Level 3 | Pension Benefits | Corporate fixed maturity securities |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 0 | 0
Realized gains (losses) | 0 | 0
Unrealized gains (losses) | (1) | 0
Purchases, sales, issuances and settlements, net | 56 | 0
Transfers into and/or out of Level 3 | 0 | 0
Estimated fair value of plan assets at December 31, | 55 | 0
Level 3 | Pension Benefits | Derivative Financial Instruments, Assets |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 0 | 0
Realized gains (losses) | 0 | 0
Unrealized gains (losses) | 1 | 0
Purchases, sales, issuances and settlements, net | 3 | 0
Transfers into and/or out of Level 3 | 0 | 0
Estimated fair value of plan assets at December 31, | 4 | 0
Level 3 | Other Postretirement Benefits |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 0 |
Estimated fair value of plan assets at December 31, | 0 | 0
Level 3 | Other Postretirement Benefits | Foreign government |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 0 |
Estimated fair value of plan assets at December 31, | 0 | 0
Level 3 | Other Postretirement Benefits | Other (1) |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 0 |
Estimated fair value of plan assets at December 31, | 0 | 0
Level 3 | Other Postretirement Benefits | Equity Securities |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 0 |
Estimated fair value of plan assets at December 31, | 0 | 0
Level 3 | Other Postretirement Benefits | Corporate fixed maturity securities |  |
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward] |  |
Estimated fair value of plan assets at January 1, | 0 |
Estimated fair value of plan assets at December 31, | $ 0 | $ 0

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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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