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Summary of Significant Accounting Policies (Noncontrolling Interest) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Redeemable Noncontrolling Interest [Line Items] |  |  |
Assets | $ 56,715 | $ 52,580 |
Liabilities | 44,063 | 38,695 |
Unnamed subsidiary |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Assets |  | 299 |
Liabilities |  | 41 |
Net (loss) income | $ 14 | $ 21 | $ 9

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