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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on investments in unconsolidated entities		$ 2,702		$ 2,756	$ 2,343
ASU 2017-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on investments in unconsolidated entities			$ 113
Cumulative effect on retained earnings			$ 113	$ 113
Forecast | Subsequent Event | Minimum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU asset	$ 550
Lease liabilities	550
Forecast | Subsequent Event | Maximum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU asset	600
Lease liabilities	$ 600

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Present value of lessee's discounted obligation for lease payments from operating lease.

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