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Investment in Unconsolidated Entities, Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2018	Jan. 01, 2018
Equity Securities without Readily Determinable Fair Value [Line Items]
Measurement alternative, impairment	$ 0
Measurement alternative, observable price change	0
Schedule of Equity Method Investments [Line Items]
Cumulative effect of accounting changes	195
Retained earnings
Schedule of Equity Method Investments [Line Items]
Cumulative effect of accounting changes	$ 165
Financial instruments | Retained earnings
Schedule of Equity Method Investments [Line Items]
Cumulative effect of accounting changes		$ 1

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