v3.8.0.1

Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Available for Sale, Amortized Cost
Due in one year or less		$ 8,244
Due after one year through five years		47,967
Due after five years through ten years		69,445
Due after ten years		158,139
Amortized Cost		312,385	$ 292,581
Available-for-Sale, Fair Value
Due in one year or less		8,711
Due after one year through five years		51,936
Due after five years through ten years		75,596
Due after ten years		181,378
Fair Value	[1]	346,780	321,419
Held-to-Maturity, Amortized Cost
Due in one year or less		0
Due after one year through five years		176
Due after five years through ten years		565
Due after ten years		862
Amortized Cost	[1]	2,049	2,144
Held-to-Maturity, Fair Value
Due in one year or less		0
Due after one year through five years		183
Due after five years through ten years		642
Due after ten years		1,127
Fixed maturities, held to maturity, fair value		2,430	2,524
Asset-backed securities
Available for Sale, Amortized Cost
Debt Maturities, without single maturity date		11,965
Available-for-Sale, Fair Value
Debt Maturities, without Single Maturity Date		12,233
Held-to-Maturity, Amortized Cost
Debt Maturities, without Single Maturity Date		0
Held-to-Maturity, Fair Value
Debt Maturities, without Single Maturity Date		0
Commercial Mortgage Backed Securities
Available for Sale, Amortized Cost
Debt Maturities, without single maturity date		13,134
Available-for-Sale, Fair Value
Debt Maturities, without Single Maturity Date		13,281
Held-to-Maturity, Amortized Cost
Debt Maturities, without Single Maturity Date		0
Held-to-Maturity, Fair Value
Debt Maturities, without Single Maturity Date		0
Residential mortgage-backed securities
Available for Sale, Amortized Cost
Debt Maturities, without single maturity date		3,491
Available-for-Sale, Fair Value
Debt Maturities, without Single Maturity Date		3,645
Held-to-Maturity, Amortized Cost
Debt Maturities, without Single Maturity Date		446
Held-to-Maturity, Fair Value
Debt Maturities, without Single Maturity Date		478
Prudential Netting Agreement | U.S. corporate private securities
Available-for-Sale, Fair Value
Fair Value		2,660	1,456
Fixed maturities
Available for Sale, Amortized Cost
Amortized Cost		312,385	292,581
Available-for-Sale, Fair Value
Fair Value		346,780	321,419
Held-to-Maturity, Amortized Cost
Amortized Cost		2,049	2,144
Held-to-Maturity, Fair Value
Fixed maturities, held to maturity, fair value		2,430	2,524
Fixed maturities | U.S. corporate private securities
Available for Sale, Amortized Cost
Amortized Cost		31,852	29,974
Available-for-Sale, Fair Value
Fair Value		33,734	31,788
Fixed maturities | Asset-backed securities
Available for Sale, Amortized Cost
Amortized Cost		11,965	11,759
Available-for-Sale, Fair Value
Fair Value		12,233	11,935
Fixed maturities | Commercial Mortgage Backed Securities
Available for Sale, Amortized Cost
Amortized Cost		13,134	12,589
Available-for-Sale, Fair Value
Fair Value		13,281	12,704
Held-to-Maturity, Amortized Cost
Amortized Cost		0	0
Held-to-Maturity, Fair Value
Fixed maturities, held to maturity, fair value		0	0
Fixed maturities | Residential mortgage-backed securities
Available for Sale, Amortized Cost
Amortized Cost		3,491	4,308
Available-for-Sale, Fair Value
Fair Value		3,645	4,532
Held-to-Maturity, Amortized Cost
Amortized Cost		446	573
Held-to-Maturity, Fair Value
Fixed maturities, held to maturity, fair value		478	616
Fixed maturities | Prudential Netting Agreement
Held-to-Maturity, Amortized Cost
Amortized Cost		4,627	4,403
Held-to-Maturity, Fair Value
Fixed maturities, held to maturity, fair value		4,913	4,403
Fixed maturities | Prudential Netting Agreement | U.S. corporate private securities
Available for Sale, Amortized Cost
Amortized Cost		2,660	1,456
Available-for-Sale, Fair Value
Fair Value		$ 2,660	$ 1,456
[1] See Note 5 for details of balances associated with variable interest entities.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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