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Investments - Additional Information (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) security | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Concentration Risk [Line Items] |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 51.00% |  |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 61.00% |  |  |
Net realized capital gains (losses) | $ (30,000,000) | $ 25,000,000 |  |
Proceeds from Sale of Available-for-sale Securities | $ 4,300,000,000 | 4,300,000,000 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 2,629 |  |  |
Percentage of AFS securities depressed less than 20% of cost or amortized cost | 98.00% |  |  |
Mortgage loans | $ 3,221,000,000 |  | $ 3,175,000,000 |
Servicing rights | 0 |  | 0 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 967,000,000 |  | 920,000,000 |
Fair value of securities on deposit | 2,600,000,000 |  | 2,500,000,000 |
Net Realized and Unrealized Gain (Loss) on Trading Securities | (14) |  |  |
U.S. Treasuries |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Pledged collateral | $ 46,000,000 |  | 104,000,000 |
Minimum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of fair value received at sale under repurchase agreements | 95.00% |  |  |
Held-for-sale |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Mortgage loans | $ 0 |  | 0 |
Allowance for Loan and Lease Losses [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Mortgage loans | 24,000,000 |  | 0 |
Commercial Loan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Mortgage Loans on Real Estate | 3,200,000,000 |  |  |
Allowance for Loan and Lease Losses, Real Estate | 1,000,000 | 0 | 1,000,000 | $ 0
Mortgage loans | 3,221,000,000 |  | 3,175,000,000 |
Commercial Loan [Member] | Mortgages [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Mortgage loans past due by 90 days or more | 0 |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Net realized capital gains (losses) | (38,000,000) | $ 14,000,000 |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Commitments | 711,000,000 |  | 0 |
Commercial Loan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Loans serviced | 1,500,000,000 |  | 1,300,000,000 |
Loans serviced on behalf of third parties | 581,000,000 |  | 402,000,000 |
Commercial Loan [Member] | Investments |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Loans serviced on behalf of third parties, retained and reported as assets | 652,000,000 |  | 566,000,000 |
Commercial Loan [Member] | Assets Held for Sale |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Loans serviced on behalf of third parties, retained and reported as assets | $ 225,000,000 |  | $ 356,000,000 |

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