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Summary of Changes in AOCI by Component (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning of year | $ 8,280 | $ 8,865 |
Other comprehensive income (loss) before reclassifications | 427 | (333) |
Amounts reclassified from AOCI | 128 | (4,447) |
Total other comprehensive income (loss), net of tax | 555 | (4,780) | $ 3,524
End of year | 9,116 | 8,280 | 8,865
CTA |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning of year | (3,438) | (3,191) |
Other comprehensive income (loss) before reclassifications | 396 | (247) |
Amounts reclassified from AOCI | 29 | 0 |
Total other comprehensive income (loss), net of tax | 425 | (247) |
End of year | (3,013) | (3,438) | (3,191)
Pension and other employee benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning of year | (1,122) | (1,025) |
Other comprehensive income (loss) before reclassifications | 50 | (191) |
Amounts reclassified from AOCI | 91 | 94 |
Total other comprehensive income (loss), net of tax | 141 | (97) |
End of year | (981) | (1,122) | (1,025)
Hedging activities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning of year | 3 | 7 |
Other comprehensive income (loss) before reclassifications | (18) | 1 |
Amounts reclassified from AOCI | 5 | (5) |
Total other comprehensive income (loss), net of tax | (13) | (4) |
End of year | (10) | 3 | 7
Available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning of year | 1 | 4,433 |
Other comprehensive income (loss) before reclassifications | (1) | 104 |
Amounts reclassified from AOCI | 3 | (4,536) |
Total other comprehensive income (loss), net of tax | 2 | (4,432) |
End of year | 3 | 1 | 4,433
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning of year | (4,556) | 224 |
End of year | $ (4,001) | $ (4,556) | $ 224

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