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Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI roll forward |  |  |
Beginning balance | $ 6,276 | $ 6,042 | $ 5,320
Other comprehensive income (loss), net of tax | 79 | (90) | 88
Ending balance | 7,070 | 6,276 | 6,042
Accumulated Other Comprehensive Loss [Member] |  |  |
AOCI roll forward |  |  |
Beginning balance | (87) | 8 | (80)
Other comprehensive income (loss) before reclassifications, net of tax | 72 | (98) | 82
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax | 7 | 8 | 6
Other comprehensive income (loss), net of tax | 79 | (90) | 88
Ending balance | (8) | (87) | 8
Accumulated Other Comprehensive Loss [Member] | Accounting Standards Update 2018-02 [Member] |  |  |
AOCI roll forward |  |  |
Adoption of new accounting standard |  | (5) |
Derivative Instruments [Member] |  |  |
AOCI roll forward |  |  |
Beginning balance | (32) | (33) | (40)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax | 8 | 8 | 7
Other comprehensive income (loss), net of tax | 8 | 8 | 7
Ending balance | (24) | (32) | (33)
Derivative Instruments [Member] | Accounting Standards Update 2018-02 [Member] |  |  |
AOCI roll forward |  |  |
Adoption of new accounting standard |  | (7) |
Available for sale Securities [Member] |  |  |
AOCI roll forward |  |  |
Beginning balance | 23 | 15 | 13
Other comprehensive income (loss) before reclassifications, net of tax | 15 | 5 | 3
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax |  |  | (1)
Other comprehensive income (loss), net of tax | 15 | 5 | 2
Ending balance | 38 | 23 | 15
Available for sale Securities [Member] | Accounting Standards Update 2018-02 [Member] |  |  |
AOCI roll forward |  |  |
Adoption of new accounting standard |  | 3 |
Foreign Currency Translation Adjustments [Member] |  |  |
AOCI roll forward |  |  |
Beginning balance | (76) | 29 | (47)
Other comprehensive income (loss) before reclassifications, net of tax | 55 | (105) | 76
Other comprehensive income (loss), net of tax | 55 | (105) | 76
Ending balance | (21) | (76) | 29
Post - Retirement Benefit Obligation [Member] |  |  |
AOCI roll forward |  |  |
Beginning balance | (2) | (3) | (6)
Other comprehensive income (loss) before reclassifications, net of tax | 2 | 2 | 3
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax | (1) |  |
Other comprehensive income (loss), net of tax | 1 | 2 | 3
Ending balance | $ (1) | (2) | $ (3)
Post - Retirement Benefit Obligation [Member] | Accounting Standards Update 2018-02 [Member] |  |  |
AOCI roll forward |  |  |
Adoption of new accounting standard |  | $ (1) |

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