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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ 21,902 | $ 23,848 | $ 21,386 | $ 24,566
Cumulative effect adjustments from changes in accounting standards |  |  |  | (91)
Balance, as adjusted |  |  |  | 24,475
Other comprehensive income (loss) | 440 | (199) | 989 | (606)
Purchase of Boardwalk Pipeline common units |  | (1,715) |  | (1,715)
Ending Balance | 22,394 | 21,858 | 22,394 | 21,858
OTTI Gains (Losses) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 18 | 18 | 14 | 22
Cumulative effect adjustments from changes in accounting standards |  |  |  | 4
Balance, as adjusted |  |  |  | 26
Other comprehensive income (loss) before reclassifications, after tax | (1) | (1) | 3 | (11)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | 1 |  | 1 | 1
Other comprehensive income (loss) |  | (1) | 4 | (10)
Amounts attributable to noncontrolling interests |  |  |  | 1
Ending Balance | 18 | 17 | 18 | 17
Unrealized Gains (Losses) on Investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 527 | 386 | 57 | 673
Cumulative effect adjustments from changes in accounting standards |  |  |  | 98
Balance, as adjusted |  |  |  | 771
Other comprehensive income (loss) before reclassifications, after tax | 434 | (156) | 955 | (570)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | 2 | (3) | 7 | (18)
Other comprehensive income (loss) | 436 | (159) | 962 | (588)
Amounts attributable to noncontrolling interests | (46) | 17 | (102) | 61
Ending Balance | 917 | 244 | 917 | 244
Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (1) | 10 | 5 |
Other comprehensive income (loss) before reclassifications, after tax | (6) | 4 | (12) | 12
Reclassification of (gains) losses from accumulated other comprehensive income, after tax |  |  |  | 2
Other comprehensive income (loss) | (6) | 4 | (12) | 14
Purchase of Boardwalk Pipeline common units |  | (1) |  | (1)
Ending Balance | (7) | 13 | (7) | 13
Pension Liability [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (786) | (753) | (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 | 7 | 9 | 16 | 19
Other comprehensive income (loss) | 7 | 9 | 15 | 19
Amounts attributable to noncontrolling interests | (1) | (2) | (2) | (2)
Purchase of Boardwalk Pipeline common units |  | (28) |  | (28)
Ending Balance | (780) | (774) | (780) | (774)
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (148) | (78) | (163) | (88)
Balance, as adjusted |  |  |  | (88)
Other comprehensive income (loss) before reclassifications, after tax | 3 | (52) | 20 | (41)
Other comprehensive income (loss) | 3 | (52) | 20 | (41)
Amounts attributable to noncontrolling interests |  | 5 | (2) | 4
Ending Balance | (145) | (125) | (145) | (125)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (390) | (417) | (880) | (26)
Cumulative effect adjustments from changes in accounting standards |  |  |  | (28)
Balance, as adjusted |  |  |  | (54)
Other comprehensive income (loss) before reclassifications, after tax | 430 | (205) | 965 | (610)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | 10 | 6 | 24 | 4
Other comprehensive income (loss) | 440 | (199) | 989 | (606)
Amounts attributable to noncontrolling interests | (47) | 20 | (106) | 64
Purchase of Boardwalk Pipeline common units |  | (29) |  | (29)
Ending Balance | $ 3 | $ (625) | $ 3 | $ (625)

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