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Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Sep. 29, 2018 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Aug. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  |  |  |  |  |  |  |  | $ (410) |  |  |  |  | $ (354) |  |  |  |  |  | $ (410) | $ (354) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (34) | (53) |
Amounts reclassified from accumulated other comprehensive loss to net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (30) | (49) |
Balance at end of the period |  |  |  |  |  |  |  |  |  |  |  |  | $ (440) | $ (410) |  |  | $ (354) |  |  |  |  | $ (440) | $ (410) | $ (354)
Common shares repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,369 | 1,333 |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 | $ 5 |
Remaining authorized repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 78 |  |  |  |  |  |  |  |  | $ 78 |  |
Common stock dividend declared and paid (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.00 | $ 6.00 | $ 6.00
Common stock dividend declared (in dollars per share) | $ 2.25 | $ 2.25 | $ 2.25 | $ 1.50 | $ 2.25 | $ 2.25 | $ 2.25 | $ 1.50 | $ 2.25 | $ 2.25 | $ 2.25 | $ 1.50 | $ 2.25 | $ 1.50 | $ 1.50 | $ 1.50 | $ 1.50 | $ 1.50 | $ 1.50 | $ 1.50 |  |  |  |
ASU 2018-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (45) |  |  |  |  |  |  | $ (45) |
Balance at end of the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (45) |  |  |  |  |  |  | $ (45)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  |  |  |  |  |  |  |  | $ (349) |  |  |  |  | (297) |  |  |  |  |  | $ (349) | (297) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20) | (52) |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20) | (52) |
Balance at end of the period |  |  |  |  |  |  |  |  |  |  |  |  | $ (369) | $ (349) |  |  | (297) |  |  |  |  | (369) | (349) | (297)
Unrealized gain on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  | 7 |
Balance at end of the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  | 7
Unrealized gain on investments | ASU 2016-01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  |  |  |  |  |  |  | (7) |
Unrecognized pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  |  |  |  |  |  |  |  | $ (61) |  |  |  |  | $ (64) |  |  |  |  |  | (61) | (64) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14) | (1) |
Amounts reclassified from accumulated other comprehensive loss to net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10) | 3 |
Balance at end of the period |  |  |  |  |  |  |  |  |  |  |  |  | (71) | (61) |  |  | (64) |  |  |  |  | (71) | (61) | (64)
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  | (45) |  |  |  |  |  | (7) | (45)
Accumulated Other Comprehensive Loss | ASU 2016-01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  |  |  |  |  |  |  | (7) |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  | $ 45 |  |  |  |  |  | 7 | 45
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 | $ 5 |
All components of AOCL except cumulative foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.00% |  |  |  | 39.00% | 26.00% | 26.00% |
Certain subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pension cost related to employees at certain subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | $ 21 | $ 23 |  |  | $ 22 |  |  |  |  | $ 21 | $ 23 | 22
Certain subsidiaries | Unrecognized pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of and changes in accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit recorded on unrecognized pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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