Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) $ in Millions	Feb. 04, 2019 USD ($)
Retained earnings | Accounting standards update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting changes	$ 31
Accumulated other comprehensive income (loss) | Accounting standards update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting changes	31
Operating lease right-of-use assets | Accounting standards update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting changes	5,700
Operating lease liabilities | Accounting standards update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting changes	$ 6,000