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Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Nov. 01, 2020
Apr. 27, 2020
Dec. 31, 2019
Mar. 04, 2019
Mar. 07, 2018
Schedule of debt            
Commercial paper $ 100     $ 100    
Total short-term debt 100     600    
Total long-term debt 6,504     6,004    
Total debt principal 6,604     6,604    
Unamortized fair value adjustment 41     43    
Unamortized debt issuance costs (95)     (89)    
Total debt 6,550     6,558    
Senior Notes [Member] | 3.90% Senior notes due November 1, 2020 [Member]            
Schedule of debt            
Current maturities of long-term debt $ 0     $ 500    
Interest rate (percent) 3.90% 3.90%   3.90%    
Senior Notes [Member] | 7.75% Senior notes due April 15, 2026 [Member]            
Schedule of debt            
Total long-term debt $ 200     $ 200    
Interest rate (percent) 7.75%     7.75%    
Senior Notes [Member] | 6.375% Senior notes due March 15, 2033 [Member]            
Schedule of debt            
Total long-term debt $ 500     $ 500    
Interest rate (percent) 6.375%     6.375%    
Senior Notes [Member] | 6.75% Senior notes due June 20, 2036 [Member]            
Schedule of debt            
Total long-term debt $ 400     $ 400    
Interest rate (percent) 6.75%     6.75%    
Senior Notes [Member] | 6.25% Senior notes due June 15, 2037 [Member]            
Schedule of debt            
Total long-term debt $ 800     $ 800    
Interest rate (percent) 6.25%     6.25%    
Senior Notes [Member] | 5.35% Senior notes due November 1, 2040 [Member]            
Schedule of debt            
Total long-term debt $ 750     $ 750    
Interest rate (percent) 5.35%     5.35%    
Senior Notes [Member] | 4.60% Senior notes due August 1, 2043 [Member]            
Schedule of debt            
Total long-term debt $ 500     $ 500    
Interest rate (percent) 4.60%     4.60%    
Senior Notes [Member] | 4.30% Senior notes due August 25, 2045 [Member]            
Schedule of debt            
Total long-term debt $ 400     $ 400    
Interest rate (percent) 4.30%     4.30%    
Senior Notes [Member] | 3.75% Senior notes due May 15, 2046 [Member]            
Schedule of debt            
Total long-term debt $ 500     $ 500    
Interest rate (percent) 3.75%     3.75%    
Senior Notes [Member] | 4.00% Senior notes due May 30, 2047 [Member]            
Schedule of debt            
Total long-term debt $ 700     $ 700    
Interest rate (percent) 4.00%     4.00%    
Senior Notes [Member] | 4.05% Senior notes due March 7, 2048 [Member]            
Schedule of debt            
Total long-term debt $ 500     $ 500    
Interest rate (percent) 4.05%     4.05%   4.05%
Senior Notes [Member] | 4.10% Senior notes due March 4, 2049 [Member]            
Schedule of debt            
Total long-term debt $ 500     $ 500    
Interest rate (percent) 4.10%     4.10% 4.10%  
Senior Notes [Member] | 2.55% Senior notes due April 27, 2050 [Member]            
Schedule of debt            
Total long-term debt $ 500          
Interest rate (percent) 2.55%   2.55%      
Junior Subordinated Debt [Member] | 7.625% Junior subordinated debentures due December 15, 2027 [Member]            
Schedule of debt            
Total long-term debt $ 125     $ 125    
Unamortized fair value adjustment $ 10     $ 11    
Interest rate (percent) 7.625%     7.625%    
Junior Subordinated Debt [Member] | 8.50% Junior subordinated debentures due December 15, 2045 [Member]            
Schedule of debt            
Total long-term debt $ 56     $ 56    
Unamortized fair value adjustment $ 14     $ 14    
Interest rate (percent) 8.50%     8.50%    
Junior Subordinated Debt [Member] | 8.312% Junior subordinated debentures due July 1, 2046 [Member]            
Schedule of debt            
Total long-term debt $ 73     $ 73    
Unamortized fair value adjustment $ 17     $ 18    
Interest rate (percent) 8.312%     8.312%