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Summary of Significant Accounting Policies (Noncontrolling Interest) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items] |  |  |
Assets | $ 52,580 | $ 51,319 |
Liabilities | 38,695 | 37,127 |
Unnamed subsidiary |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Assets | 299 | 74 |
Liabilities | 41 | 23 |
Net income | $ 21 | $ 9 | $ 16

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