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Debt Level 4 (Details) - USD ($)	12 Months Ended			240 Months Ended	600 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 15, 2042	Jun. 15, 2068	Oct. 17, 2016
Schedule of Debt [Line Items]
Senior Notes	$ 416,000,000
Short-term Debt [Abstract]
Long-term Line of Credit	0	$ 0
Notes Payable	5,174,000,000	5,449,000,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(122,000,000)	(90,000,000)
Long-term Debt, Excluding Current Maturities	4,636,000,000	5,084,000,000
Current maturity adjustment to long-term debt	(416,000,000)	(275,000,000)
Debt, Long-term and Short-term, Combined Amount	5,052,000,000	5,359,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest Expense	339,000,000	357,000,000	$ 376,000,000
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty	1,100,000,000
Maximum Aggregate Principal Amount of Junior Subordinated Notes	500,000,000
Loss on extinguishment of debt	0	(21,000,000)	$ 0
Long-term Federal Home Loan Bank Advances	0
Line of Credit Facility [Abstract]
Commercial Paper	1,000,000,000
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Year Two	320,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	413,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	500,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	3,525,000,000
Commercial Paper, Outstanding	0
Debt Instrument, Repurchase Amount						$ 275,000,000
Five Year Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	1,000,000,000
Borrowings [Member]
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Amount Outstanding During Period	0
Senior Note Five Point Three Seven Five Due in Two Thousand Seventeen [Member]
Short-term Debt [Abstract]
Senior Notes	416,000,000
Senior Note Five Point Five Percent Due in Two Thousand Sixteen [Member]
Short-term Debt [Abstract]
Senior Notes	$ 0
Revolving Credit Facility [Member] | Four Year Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Line of Credit, Term of Credit Facility	4 years
Revolving Credit Facility [Member] | Five Year Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Line of Credit, Term of Credit Facility	5 years
Senior Note Four Point Zero Percent Due in Two Thousand Fifteen [Member]
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.00%
Senior Note Seven Point Three Percent Due in Two Thousand Fifteen [Member]
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	7.30%
Senior Note Five Point Five Percent Due in Two Thousand Sixteen [Member]
Short-term Debt [Abstract]
Senior Notes		275,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Senior Note Five Point Three Seven Five Due in Two Thousand Seventeen [Member]
Short-term Debt [Abstract]
Senior Notes		416,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.375%
Senior Note 4.0% Due 2017 [Member]
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.00%
Senior Note 6.3% Due 2018 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 320,000,000	320,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	6.30%
Senior Note 6.0% Due 2019 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 413,000,000	413,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Senior Note 5.5% Due 2020 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 500,000,000	500,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Senior Note 5.125% Due 2022 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 800,000,000	800,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.125%
Senior Note 7.65% Due 2027 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 80,000,000	80,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	7.65%
Senior Note 7.375% Due 2031 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 63,000,000	63,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Senior Note 5.95% Due 2036 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 300,000,000	300,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.95%
Senior Note 6.625% Due 2040 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 295,000,000	295,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	6.625%
Senior Note 6.1% Due 2041 [Member]
Schedule of Debt [Line Items]
Debt Issuance Costs, Gross	$ 83,000,000	81,000,000
Short-term Debt [Abstract]
Senior Notes	$ 409,000,000	409,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	6.10%
Debt Instrument, Interest Rate, Effective Percentage	7.90%
Senior Note 6.625% Due 2042 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 178,000,000	178,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	6.625%
Senior Note 4.3% Due in 2043 [Member]
Short-term Debt [Abstract]
Senior Notes	$ 300,000,000	300,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.30%
7.875% Notes, due 2042 [Member]
Short-term Debt [Abstract]
Junior Subordinated Notes	$ 600,000,000	600,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	7.875%
8.125% Notes, due 2068 [Member]
Short-term Debt [Abstract]
Junior Subordinated Notes	$ 500,000,000	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	8.125%
Scenario, Forecast [Member] | 7.875% Notes, due 2042 [Member]
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate Terms				3 Month LIBOR + 5.596%
Scenario, Forecast [Member] | 8.125% Notes, due 2068 [Member]
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Debt Instrument, Interest Rate Terms					3 Month LIBOR + 4.6025%

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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