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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 22, 2017 | Mar. 30, 2018 | Dec. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 29, 2018 | Mar. 30, 2018 | Mar. 31, 2017 | Jun. 29, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Statutory tax rate |  | 35.00% |  |  |  |  |  |  |  |
Estimated write-down to deferred tax assets balance due to changes in enacted tax rate |  |  | $ (19) | $ (52) |  |  |  |  |  |
Estimated write-down to deferred tax asset balance per diluted share (in dollars per share) |  |  | $ 0.15 | $ 0.43 |  |  |  |  |  |
Provisional income tax benefit from the impact of lower corporate tax rates in estimated annual rate for fiscal year |  |  |  | $ 26 |  |  |  |  |  |
Provisional income tax benefit from the impact of lower corporate tax rates in estimated annual rate for fiscal year, per diluted share (in dollars per share) |  |  |  | $ 0.21 |  |  |  |  |  |
Income tax benefit recorded due to change in estimated write-down of net deferred tax asset balance |  |  | $ 33 |  |  |  |  |  |  |
Income tax benefit recorded due to change in estimated write-down of net deferred tax asset balance per diluted share (in dollars per share) |  |  | $ 0.27 |  |  |  |  |  |  |
Effective tax rate |  |  | 5.60% |  |  | 29.60% |  | 24.60% | 29.70% |
Benefit from favorable impact of releasing uncertain tax positions and excess tax benefits related to equity-based compensation |  |  |  |  |  |  |  | $ 22 |  |
Benefit from favorable impact of releasing uncertain tax positions and excess tax benefits related to equity-based compensation, per diluted share (in dollars per share) |  |  |  |  |  |  |  | $ 0.18 |  |
Deferred tax liability for netted foreign E&P |  |  | $ 25 |  |  |  |  | $ 25 |  |
Increase in deferred tax liability due to potential cumulative basis differences in netted foreign E&P |  |  | 116 |  |  |  |  | 116 |  |
Pension |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Defined benefit plan, voluntary contributions by employer during period |  |  | 301 |  |  |  |  | 301 |  |
U.S. | Pension |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Defined benefit plan, voluntary contributions by employer during period |  |  | $ 300 |  | $ 400 | $ 40 |  | $ 300 | $ 143 |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Statutory tax rate |  |  |  |  |  |  | 21.00% |  |  | 28.00%
Effective tax rate at which deferred tax assets and liabilities will be reversed after fiscal year | 21.00% |  |  |  |  |  |  |  |  |

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