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Debt - Short-term and Long-term Debt by Issuance (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2017
Dec. 31, 2020
Dec. 31, 2019
Schedule of Debt [Line Items]      
Revolving Credit Facilities   $ 0 $ 0
Total Notes and Debentures   4,482 4,982
Unamortized discount and debt issuance cost [2]   130 134
Total Debt   4,352 4,848
Less: Current maturities   0 500
Long-Term Debt   $ 4,352 4,348
Derivative, Fixed Interest Rate 4.39% 4.39%  
Interest rate derivatives      
Schedule of Debt [Line Items]      
Derivative, Maturity Date   Feb. 15, 2027  
5.5% Notes, due 2020      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.50%  
Senior Notes and Debentures   $ 0 500
2.8% Notes, due 2029      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.80%  
Senior Notes and Debentures   $ 600 600
5.95% Notes, due 2036      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.95%  
Senior Notes and Debentures   $ 300 300
6.625% Notes, due 2040      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.625%  
Senior Notes and Debentures   $ 295 295
6.1% Notes, due 2041      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.10%  
Senior Notes and Debentures   $ 409 409
Debt Instrument, Unamortized Discount   $ 75 76
6.625% Notes, due 2042      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.625%  
Senior Notes and Debentures   $ 178 178
Senior Note Four Point Four Due in Two Thousand Forty Eight [Member]      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.40%  
Senior Notes and Debentures   $ 500 500
3.6% Notes, due 2049      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.60%  
Senior Notes and Debentures   $ 800 800
4.3% Notes, due 2043      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.30%  
Senior Notes and Debentures   $ 300 300
7.875% Notes, due 2042      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   7.875%  
Junior Subordinated Debentures   $ 600 600
7.875% Notes, due 2042 | Interest Rate Subsequent to Call Date [Member]      
Schedule of Debt [Line Items]      
Debt Instrument, Basis Spread on Variable Rate   5.596%  
LIBOR Plus Two Point One Two Five Percent Junior Subordinated Notes Due Two Thousand Sixty Seven [Member]      
Schedule of Debt [Line Items]      
Junior Subordinated Debentures   $ 500 500
LIBOR Plus Two Point One Two Five Percent Junior Subordinated Notes Due Two Thousand Sixty Seven [Member] | Interest Rate Subsequent to Call Date [Member]      
Schedule of Debt [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 2.125% 2.125%  
Junior Subordinated Notes Eight Point One Two Five Percent Due Two Thousand Sixty Eight [Member]      
Schedule of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   8.125%  
Junior Subordinated Debentures   $ 0 $ 0