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Accumulated Other Comprehensive Income (Loss) (Other Comprehensive Income (Loss) Reclassification Adjustments) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |
Pretax change before reclassifications |  | $ (387) |  | $ 61 |  | $ (883) | $ (62)
Reclassifications out of AOCI |  | 8 |  | (6) |  | 11 | (9)
Tax effect |  | 90 |  | (11) |  | 214 | 19
Total other comprehensive (loss) income, net of tax |  | (289) | $ (369) | 44 | $ (96) | (658) | (52)
Unrealized Gains (Losses) on Debt Securities |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |
Pretax change before reclassifications |  | (363) |  | 56 |  | (860) | (71)
Reclassifications out of AOCI |  | 7 |  | (6) |  | 8 | (11)
Tax effect |  | 89 |  | (13) |  | 214 | 19
Total other comprehensive (loss) income, net of tax |  | (267) |  | 37 |  | (638) | (63)
Foreign Currency Translation Adjustment |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |
Pretax change before reclassifications |  | (24) |  | 5 |  | (23) | 9
Reclassifications out of AOCI |  | 0 |  | 0 |  | 0 | 0
Tax effect |  | 1 |  | 2 |  | 1 | 0
Total other comprehensive (loss) income, net of tax |  | (23) |  | 7 |  | (22) | 9
Pension Benefit Adjustment |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |
Pretax change before reclassifications |  | 0 |  | 0 |  | 0 | 0
Reclassifications out of AOCI | [1] | 1 |  | 0 |  | 3 | 2
Tax effect |  | 0 |  | 0 |  | (1) | 0
Total other comprehensive (loss) income, net of tax |  | $ 1 |  | $ 0 |  | $ 2 | $ 2
[1] | Amounts are components of net periodic cost. See Note 11 Employee Benefit Plans for additional details

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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