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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 990
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	5,511
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	2,991
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	3,510
Debt Securities, Available-for-sale, Amortized Cost	15,335
Available-for-sale Securities With Established Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Due To Mature Less Than One Year	993
Due to mature one year through five years	5,630
Due to mature after five years through ten years	3,125
Due to mature greater than ten years	3,768
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	704	$ 2,409
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	8	36
Available-for-sale Securities, Fair Value	15,897	15,255
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	0
Available-for-sale Securities, Fair Value	595	577
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	577
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	595
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Available-for-sale Securities, Fair Value	637	605
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	608
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	637
Other Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	486	528
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7	15
Available-for-sale Securities, Fair Value	1,149	1,085
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	1,148
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,149
Other Asset-Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	486
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7
Commercial Mortgage Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Residential Mortgage Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Maturing in Less than one Year [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	21
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Maturing in One Through Five Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	43
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1
Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	88
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Maturing in Greater Than Ten Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	64
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Experience Rated Products [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Fair Value	939	$ 916
Supporting Experience Rated Products [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	11
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Experience Rated Products [Member] | Other Asset-Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Experience Rated Products [Member] | Commercial Mortgage Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Experience Rated Products [Member] | Residential Mortgage Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Experience Rated Products [Member] | Maturing in Less than one Year [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Experience Rated Products [Member] | Maturing in One Through Five Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Experience Rated Products [Member] | Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Experience Rated Products [Member] | Maturing in Greater Than Ten Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Remaining Products [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	693
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	8
Supporting Remaining Products [Member] | Other Asset-Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	486
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7
Supporting Remaining Products [Member] | Commercial Mortgage Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Remaining Products [Member] | Residential Mortgage Backed Securities [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Remaining Products [Member] | Maturing in Less than one Year [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	20
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Remaining Products [Member] | Maturing in One Through Five Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	43
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1
Supporting Remaining Products [Member] | Maturing After Five Years Through Ten Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	82
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Supporting Remaining Products [Member] | Maturing in Greater Than Ten Years [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	60
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0

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