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Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
AOCI roll forward |  |  |  |  |
Beginning balance | $ 6,042 | $ 6,042 | $ 5,320 | $ 5,367 |
Other comprehensive income (loss), net of tax |  | (90) | 88 | 47 |
Ending balance |  | 6,276 | 6,042 | 5,320 |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |
AOCI roll forward |  |  |  |  |
Adoption of new accounting standard | 5 |  |  |  |
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
AOCI roll forward |  |  |  |  |
Beginning balance | 8 | 8 | (80) | (127) |
Other comprehensive income (loss) before reclassifications, net of tax |  | (98) | 82 | 24 |
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax |  | 8 | 6 | 23 |
Other comprehensive income (loss), net of tax |  | (90) | 88 | 47 |
Ending balance |  | (87) | 8 | (80) |
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 | (33) | (33) | (40) | (52) |
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  | (7) |
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax |  | 8 | 7 | 19 |
Other comprehensive income (loss), net of tax |  | 8 | 7 | 12 |
Ending balance |  | (32) | (33) | (40) |
Derivative Instruments [Member] | Foreign Currency Derivatives [Member] |  |  |  |  |
AOCI roll forward |  |  |  |  |
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  | 7 |
Outstanding derivatives |  |  |  |  | $ 0
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 | 15 | 15 | 13 | 8 |
Other comprehensive income (loss) before reclassifications, net of tax |  | 5 | 3 | 5 |
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax |  |  | (1) |  |
Other comprehensive income (loss), net of tax |  | 5 | 2 | 5 |
Ending balance |  | 23 | 15 | 13 |
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 | 29 | 29 | (47) | (75) |
Other comprehensive income (loss) before reclassifications, net of tax |  | (105) | 76 | 26 |
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax |  |  |  | 2 |
Other comprehensive income (loss), net of tax |  | (105) | 76 | 28 |
Ending balance |  | (76) | 29 | (47) |
Post - Retirement Benefit Obligation [Member] |  |  |  |  |
AOCI roll forward |  |  |  |  |
Beginning balance | $ (3) | (3) | (6) | (8) |
Other comprehensive income (loss) before reclassifications, net of tax |  | 2 | 3 |  |
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax |  |  |  | 2 |
Other comprehensive income (loss), net of tax |  | 2 | 3 | 2 |
Ending balance |  | (2) | $ (3) | $ (6) |
Post - Retirement Benefit Obligation [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |
AOCI roll forward |  |  |  |  |
Adoption of new accounting standard |  | $ (1) |  |  |

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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