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Business Acquisitions - Additional Information (Details) - USD ($) $ in Millions				2 Months Ended	3 Months Ended									9 Months Ended	12 Months Ended
	Nov. 01, 2017	Jul. 30, 2016	Jul. 29, 2016	Dec. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Revenues					$ 4,633	$ 4,842	$ 4,789	$ 4,691	$ 4,587	$ 4,192	$ 4,214	$ 4,169			$ 18,955	$ 17,162	$ 16,291
Net income (loss) available to common stockholders					190	432	$ 582	$ 597	(3,703)	$ 234	$ (40)	$ 378			1,801	(3,131)	896
Goodwill				$ 1,290	1,290				$ 1,290				$ 567		1,290	$ 1,290	$ 567
Aetna Group Insurance [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 1,452
Payments to Acquire Businesses, Gross	1,450
Business Combination, Consideration Transferred, Other	2
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Assets						80								$ 80
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Liabilities						$ 80								$ 80
Revenues				370
Net income (loss) available to common stockholders				37
Goodwill	$ 723				$ 723										$ 723
Business Combination, Acquisition Related Costs				$ 17
Maxum [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 169
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Goodwill			$ 38
Business Combination, Acquisition Related Costs													1
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Lattice [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			$ 42
Payments to Acquire Businesses, Gross			19
Goodwill			$ 31
Business Combination, Acquisition Related Costs													$ 1
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Assets under Management, Carrying Amount			$ 200
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			$ 60
Business Combination, Contingent Consideration Arrangement, Payment Period			4 years
Customer Relationships [Member] | Aetna Group Insurance [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Goodwill	$ 723
Marketing agreement with Aetna | Aetna Group Insurance [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired, Term of Agreement	3 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Computer Software, Intangible Asset [Member] | Aetna Group Insurance [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Member] | Aetna Group Insurance [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

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