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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ 21,386 | $ 24,566
Cumulative effect adjustments from changes in accounting standards |  | (91)
Balance, as adjusted |  | 24,475
Other comprehensive income (loss) | 549 | (407)
Ending Balance | 21,902 | 23,848
OTTI Gains (Losses) [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 14 | 22
Cumulative effect adjustments from changes in accounting standards |  | 4
Balance, as adjusted |  | 26
Other comprehensive income (loss) before reclassifications, after tax | 4 | (10)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax |  | 1
Other comprehensive income (loss) | 4 | (9)
Amounts attributable to noncontrolling interests |  | 1
Ending Balance | 18 | 18
Unrealized Gains (Losses) on Investments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 57 | 673
Cumulative effect adjustments from changes in accounting standards |  | 98
Balance, as adjusted |  | 771
Other comprehensive income (loss) before reclassifications, after tax | 521 | (414)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | 5 | (15)
Other comprehensive income (loss) | 526 | (429)
Amounts attributable to noncontrolling interests | (56) | 44
Ending Balance | 527 | 386
Cash Flow Hedges [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 5 | 0
Balance, as adjusted |  | 0
Other comprehensive income (loss) before reclassifications, after tax | (6) | 8
Reclassification of (gains) losses from accumulated other comprehensive income, after tax |  | 2
Other comprehensive income (loss) | (6) | 10
Ending Balance | (1) | 10
Pension Liability [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (793) | (633)
Cumulative effect adjustments from changes in accounting standards |  | (130)
Balance, as adjusted |  | (763)
Other comprehensive income (loss) before reclassifications, after tax | (1) |
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | 9 | 10
Other comprehensive income (loss) | 8 | 10
Amounts attributable to noncontrolling interests | (1) |
Ending Balance | (786) | (753)
Foreign Currency Translation [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (163) | (88)
Balance, as adjusted |  | (88)
Other comprehensive income (loss) before reclassifications, after tax | 17 | 11
Other comprehensive income (loss) | 17 | 11
Amounts attributable to noncontrolling interests | (2) | (1)
Ending Balance | (148) | (78)
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (880) | (26)
Cumulative effect adjustments from changes in accounting standards |  | (28)
Balance, as adjusted |  | (54)
Other comprehensive income (loss) before reclassifications, after tax | 535 | (405)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | 14 | (2)
Other comprehensive income (loss) | 549 | (407)
Amounts attributable to noncontrolling interests | (59) | 44
Ending Balance | $ (390) | $ (417)

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